FM / dist

/var/www/qr4y.gr/server/delivery/node_modules/@firebase/database-compat/dist/

/var/www/qr4y.gr/server/delivery/node_modules/@firebase/database-compat/dist

Name	Size	Mode	Actions
database-compat/	-	0755	rm
node-esm/	-	0755	rm
index.esm5.js	39881	0644	edit dl rm
index.esm5.js.map	68261	0644	edit dl rm
index.esm2017.js	35519	0644	edit dl rm
index.esm2017.js.map	64141	0644	edit dl rm
index.js	40380	0644	edit dl rm
index.js.map	69290	0644	edit dl rm
index.standalone.js	737165	0644	edit dl rm
index.standalone.js.map	1341709	0644	edit dl rm

Edit: /var/www/qr4y.gr/server/delivery/node_modules/@firebase/database-compat/dist/index.standalone.js (737165B)

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

var require$$2 = require('util');
var require$$0 = require('buffer');
var require$$1 = require('events');
var require$$0$1 = require('stream');
var require$$1$1 = require('crypto');
var require$$2$1 = require('url');
var require$$0$2 = require('assert');
var require$$1$2 = require('net');
var require$$2$2 = require('tls');
var require$$1$3 = require('@firebase/util');
var require$$2$3 = require('tslib');
var require$$3 = require('@firebase/logger');
var component = require('@firebase/component');

function _interopDefaultLegacy (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var require$$2__default = /*#__PURE__*/_interopDefaultLegacy(require$$2);
var require$$0__default = /*#__PURE__*/_interopDefaultLegacy(require$$0);
var require$$1__default = /*#__PURE__*/_interopDefaultLegacy(require$$1);
var require$$0__default$1 = /*#__PURE__*/_interopDefaultLegacy(require$$0$1);
var require$$1__default$1 = /*#__PURE__*/_interopDefaultLegacy(require$$1$1);
var require$$2__default$1 = /*#__PURE__*/_interopDefaultLegacy(require$$2$1);
var require$$0__default$2 = /*#__PURE__*/_interopDefaultLegacy(require$$0$2);
var require$$1__default$2 = /*#__PURE__*/_interopDefaultLegacy(require$$1$2);
var require$$2__default$2 = /*#__PURE__*/_interopDefaultLegacy(require$$2$2);
var require$$1__default$3 = /*#__PURE__*/_interopDefaultLegacy(require$$1$3);
var require$$2__default$3 = /*#__PURE__*/_interopDefaultLegacy(require$$2$3);
var require$$3__default = /*#__PURE__*/_interopDefaultLegacy(require$$3);

var index_standalone = {};

var safeBuffer = {exports: {}};

/*! safe-buffer. MIT License. Feross Aboukhadijeh <https://feross.org/opensource> */

(function (module, exports) {
/* eslint-disable node/no-deprecated-api */
var buffer = require$$0__default["default"];
var Buffer = buffer.Buffer;

// alternative to using Object.keys for old browsers
function copyProps (src, dst) {
  for (var key in src) {
    dst[key] = src[key];
  }
}
if (Buffer.from && Buffer.alloc && Buffer.allocUnsafe && Buffer.allocUnsafeSlow) {
  module.exports = buffer;
} else {
  // Copy properties from require('buffer')
  copyProps(buffer, exports);
  exports.Buffer = SafeBuffer;
}

function SafeBuffer (arg, encodingOrOffset, length) {
  return Buffer(arg, encodingOrOffset, length)
}

SafeBuffer.prototype = Object.create(Buffer.prototype);

// Copy static methods from Buffer
copyProps(Buffer, SafeBuffer);

SafeBuffer.from = function (arg, encodingOrOffset, length) {
  if (typeof arg === 'number') {
    throw new TypeError('Argument must not be a number')
  }
  return Buffer(arg, encodingOrOffset, length)
};

SafeBuffer.alloc = function (size, fill, encoding) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  var buf = Buffer(size);
  if (fill !== undefined) {
    if (typeof encoding === 'string') {
      buf.fill(fill, encoding);
    } else {
      buf.fill(fill);
    }
  } else {
    buf.fill(0);
  }
  return buf
};

SafeBuffer.allocUnsafe = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return Buffer(size)
};

SafeBuffer.allocUnsafeSlow = function (size) {
  if (typeof size !== 'number') {
    throw new TypeError('Argument must be a number')
  }
  return buffer.SlowBuffer(size)
};
}(safeBuffer, safeBuffer.exports));

var streams$1 = {};

/**

Streams in a WebSocket connection
---------------------------------

We model a WebSocket as two duplex streams: one stream is for the wire protocol
over an I/O socket, and the other is for incoming/outgoing messages.

+----------+      +---------+      +----------+
    [1] write(chunk) -->| ~~~~~~~~ +----->| parse() +----->| ~~~~~~~~ +--> emit('data') [2]
                        |          |      +----+----+      |          |
                        |          |           |           |          |
                        |    IO    |           | [5]       | Messages |
                        |          |           V           |          |
                        |          |      +---------+      |          |
    [4] emit('data') <--+ ~~~~~~~~ |<-----+ frame() |<-----+ ~~~~~~~~ |<-- write(chunk) [3]
                        +----------+      +---------+      +----------+

Message transfer in each direction is simple: IO receives a byte stream [1] and
sends this stream for parsing. The parser will periodically emit a complete
message text on the Messages stream [2]. Similarly, when messages are written
to the Messages stream [3], they are framed using the WebSocket wire format and
emitted via IO [4].

There is a feedback loop via [5] since some input from [1] will be things like
ping, pong and close frames. In these cases the protocol responds by emitting
responses directly back to [4] rather than emitting messages via [2].

For the purposes of flow control, we consider the sources of each Readable
stream to be as follows:

* [2] receives input from [1]
* [4] receives input from [1] and [3]

The classes below express the relationships described above without prescribing
anything about how parse() and frame() work, other than assuming they emit
'data' events to the IO and Messages streams. They will work with any protocol
driver having these two methods.
**/

var Stream$3 = require$$0__default$1["default"].Stream,
    util$c   = require$$2__default["default"];

var IO = function(driver) {
  this.readable = this.writable = true;
  this._paused  = false;
  this._driver  = driver;
};
util$c.inherits(IO, Stream$3);

// The IO pause() and resume() methods will be called when the socket we are
// piping to gets backed up and drains. Since IO output [4] comes from IO input
// [1] and Messages input [3], we need to tell both of those to return false
// from write() when this stream is paused.

IO.prototype.pause = function() {
  this._paused = true;
  this._driver.messages._paused = true;
};

IO.prototype.resume = function() {
  this._paused = false;
  this.emit('drain');

var messages = this._driver.messages;
  messages._paused = false;
  messages.emit('drain');
};

// When we receive input from a socket, send it to the parser and tell the
// source whether to back off.
IO.prototype.write = function(chunk) {
  if (!this.writable) return false;
  this._driver.parse(chunk);
  return !this._paused;
};

// The IO end() method will be called when the socket piping into it emits
// 'close' or 'end', i.e. the socket is closed. In this situation the Messages
// stream will not emit any more data so we emit 'end'.
IO.prototype.end = function(chunk) {
  if (!this.writable) return;
  if (chunk !== undefined) this.write(chunk);
  this.writable = false;

var messages = this._driver.messages;
  if (messages.readable) {
    messages.readable = messages.writable = false;
    messages.emit('end');
  }
};

IO.prototype.destroy = function() {
  this.end();
};

var Messages = function(driver) {
  this.readable = this.writable = true;
  this._paused  = false;
  this._driver  = driver;
};
util$c.inherits(Messages, Stream$3);

// The Messages pause() and resume() methods will be called when the app that's
// processing the messages gets backed up and drains. If we're emitting
// messages too fast we should tell the source to slow down. Message output [2]
// comes from IO input [1].

Messages.prototype.pause = function() {
  this._driver.io._paused = true;
};

Messages.prototype.resume = function() {
  this._driver.io._paused = false;
  this._driver.io.emit('drain');
};

// When we receive messages from the user, send them to the formatter and tell
// the source whether to back off.
Messages.prototype.write = function(message) {
  if (!this.writable) return false;
  if (typeof message === 'string') this._driver.text(message);
  else this._driver.binary(message);
  return !this._paused;
};

// The Messages end() method will be called when a stream piping into it emits
// 'end'. Many streams may be piped into the WebSocket and one of them ending
// does not mean the whole socket is done, so just process the input and move
// on leaving the socket open.
Messages.prototype.end = function(message) {
  if (message !== undefined) this.write(message);
};

Messages.prototype.destroy = function() {};

streams$1.IO = IO;
streams$1.Messages = Messages;

var Headers$3 = function() {
  this.clear();
};

Headers$3.prototype.ALLOWED_DUPLICATES = ['set-cookie', 'set-cookie2', 'warning', 'www-authenticate'];

Headers$3.prototype.clear = function() {
  this._sent  = {};
  this._lines = [];
};

Headers$3.prototype.set = function(name, value) {
  if (value === undefined) return;

name = this._strip(name);
  value = this._strip(value);

var key = name.toLowerCase();
  if (!this._sent.hasOwnProperty(key) || this.ALLOWED_DUPLICATES.indexOf(key) >= 0) {
    this._sent[key] = true;
    this._lines.push(name + ': ' + value + '\r\n');
  }
};

Headers$3.prototype.toString = function() {
  return this._lines.join('');
};

Headers$3.prototype._strip = function(string) {
  return string.toString().replace(/^ */, '').replace(/ *$/, '');
};

var headers = Headers$3;

var Buffer$9 = safeBuffer.exports.Buffer;

var StreamReader = function() {
  this._queue     = [];
  this._queueSize = 0;
  this._offset    = 0;
};

StreamReader.prototype.put = function(buffer) {
  if (!buffer || buffer.length === 0) return;
  if (!Buffer$9.isBuffer(buffer)) buffer = Buffer$9.from(buffer);
  this._queue.push(buffer);
  this._queueSize += buffer.length;
};

StreamReader.prototype.read = function(length) {
  if (length > this._queueSize) return null;
  if (length === 0) return Buffer$9.alloc(0);

this._queueSize -= length;

var queue  = this._queue,
      remain = length,
      first  = queue[0],
      buffers, buffer;

if (first.length >= length) {
    if (first.length === length) {
      return queue.shift();
    } else {
      buffer = first.slice(0, length);
      queue[0] = first.slice(length);
      return buffer;
    }
  }

for (var i = 0, n = queue.length; i < n; i++) {
    if (remain < queue[i].length) break;
    remain -= queue[i].length;
  }
  buffers = queue.splice(0, i);

if (remain > 0 && queue.length > 0) {
    buffers.push(queue[0].slice(0, remain));
    queue[0] = queue[0].slice(remain);
  }
  return Buffer$9.concat(buffers, length);
};

StreamReader.prototype.eachByte = function(callback, context) {
  var buffer, n, index;

while (this._queue.length > 0) {
    buffer = this._queue[0];
    n = buffer.length;

while (this._offset < n) {
      index = this._offset;
      this._offset += 1;
      callback.call(context, buffer[index]);
    }
    this._offset = 0;
    this._queue.shift();
  }
};

var stream_reader = StreamReader;

var Buffer$8  = safeBuffer.exports.Buffer,
    Emitter = require$$1__default["default"].EventEmitter,
    util$b    = require$$2__default["default"],
    streams = streams$1,
    Headers$2 = headers,
    Reader  = stream_reader;

var Base$7 = function(request, url, options) {
  Emitter.call(this);
  Base$7.validateOptions(options || {}, ['maxLength', 'masking', 'requireMasking', 'protocols']);

this._request   = request;
  this._reader    = new Reader();
  this._options   = options || {};
  this._maxLength = this._options.maxLength || this.MAX_LENGTH;
  this._headers   = new Headers$2();
  this.__queue    = [];
  this.readyState = 0;
  this.url        = url;

this.io = new streams.IO(this);
  this.messages = new streams.Messages(this);
  this._bindEventListeners();
};
util$b.inherits(Base$7, Emitter);

Base$7.isWebSocket = function(request) {
  var connection = request.headers.connection || '',
      upgrade    = request.headers.upgrade || '';

return request.method === 'GET' &&
         connection.toLowerCase().split(/ *, */).indexOf('upgrade') >= 0 &&
         upgrade.toLowerCase() === 'websocket';
};

Base$7.validateOptions = function(options, validKeys) {
  for (var key in options) {
    if (validKeys.indexOf(key) < 0)
      throw new Error('Unrecognized option: ' + key);
  }
};

var instance$b = {
  // This is 64MB, small enough for an average VPS to handle without
  // crashing from process out of memory
  MAX_LENGTH: 0x3ffffff,

STATES: ['connecting', 'open', 'closing', 'closed'],

_bindEventListeners: function() {
    var self = this;

// Protocol errors are informational and do not have to be handled
    this.messages.on('error', function() {});

this.on('message', function(event) {
      var messages = self.messages;
      if (messages.readable) messages.emit('data', event.data);
    });

this.on('error', function(error) {
      var messages = self.messages;
      if (messages.readable) messages.emit('error', error);
    });

this.on('close', function() {
      var messages = self.messages;
      if (!messages.readable) return;
      messages.readable = messages.writable = false;
      messages.emit('end');
    });
  },

getState: function() {
    return this.STATES[this.readyState] || null;
  },

addExtension: function(extension) {
    return false;
  },

setHeader: function(name, value) {
    if (this.readyState > 0) return false;
    this._headers.set(name, value);
    return true;
  },

start: function() {
    if (this.readyState !== 0) return false;

if (!Base$7.isWebSocket(this._request))
      return this._failHandshake(new Error('Not a WebSocket request'));

var response;

try {
      response = this._handshakeResponse();
    } catch (error) {
      return this._failHandshake(error);
    }

this._write(response);
    if (this._stage !== -1) this._open();
    return true;
  },

_failHandshake: function(error) {
    var headers = new Headers$2();
    headers.set('Content-Type', 'text/plain');
    headers.set('Content-Length', Buffer$8.byteLength(error.message, 'utf8'));

headers = ['HTTP/1.1 400 Bad Request', headers.toString(), error.message];
    this._write(Buffer$8.from(headers.join('\r\n'), 'utf8'));
    this._fail('protocol_error', error.message);

return false;
  },

text: function(message) {
    return this.frame(message);
  },

binary: function(message) {
    return false;
  },

ping: function() {
    return false;
  },

pong: function() {
      return false;
  },

close: function(reason, code) {
    if (this.readyState !== 1) return false;
    this.readyState = 3;
    this.emit('close', new Base$7.CloseEvent(null, null));
    return true;
  },

_open: function() {
    this.readyState = 1;
    this.__queue.forEach(function(args) { this.frame.apply(this, args); }, this);
    this.__queue = [];
    this.emit('open', new Base$7.OpenEvent());
  },

_queue: function(message) {
    this.__queue.push(message);
    return true;
  },

_write: function(chunk) {
    var io = this.io;
    if (io.readable) io.emit('data', chunk);
  },

_fail: function(type, message) {
    this.readyState = 2;
    this.emit('error', new Error(message));
    this.close();
  }
};

for (var key$b in instance$b)
  Base$7.prototype[key$b] = instance$b[key$b];

Base$7.ConnectEvent = function() {};

Base$7.OpenEvent = function() {};

Base$7.CloseEvent = function(code, reason) {
  this.code   = code;
  this.reason = reason;
};

Base$7.MessageEvent = function(data) {
  this.data = data;
};

Base$7.PingEvent = function(data) {
  this.data = data;
};

Base$7.PongEvent = function(data) {
  this.data = data;
};

var base = Base$7;

var httpParser = {};

/*jshint node:true */
var assert = require$$0__default$2["default"];

httpParser.HTTPParser = HTTPParser;
function HTTPParser(type) {
  assert.ok(type === HTTPParser.REQUEST || type === HTTPParser.RESPONSE || type === undefined);
  if (type === undefined) ; else {
    this.initialize(type);
  }
}
HTTPParser.prototype.initialize = function (type, async_resource) {
  assert.ok(type === HTTPParser.REQUEST || type === HTTPParser.RESPONSE);
  this.type = type;
  this.state = type + '_LINE';
  this.info = {
    headers: [],
    upgrade: false
  };
  this.trailers = [];
  this.line = '';
  this.isChunked = false;
  this.connection = '';
  this.headerSize = 0; // for preventing too big headers
  this.body_bytes = null;
  this.isUserCall = false;
  this.hadError = false;
};

HTTPParser.encoding = 'ascii';
HTTPParser.maxHeaderSize = 80 * 1024; // maxHeaderSize (in bytes) is configurable, but 80kb by default;
HTTPParser.REQUEST = 'REQUEST';
HTTPParser.RESPONSE = 'RESPONSE';

// Note: *not* starting with kOnHeaders=0 line the Node parser, because any
//   newly added constants (kOnTimeout in Node v12.19.0) will overwrite 0!
var kOnHeaders = HTTPParser.kOnHeaders = 1;
var kOnHeadersComplete = HTTPParser.kOnHeadersComplete = 2;
var kOnBody = HTTPParser.kOnBody = 3;
var kOnMessageComplete = HTTPParser.kOnMessageComplete = 4;

// Some handler stubs, needed for compatibility
HTTPParser.prototype[kOnHeaders] =
HTTPParser.prototype[kOnHeadersComplete] =
HTTPParser.prototype[kOnBody] =
HTTPParser.prototype[kOnMessageComplete] = function () {};

var compatMode0_12 = true;
Object.defineProperty(HTTPParser, 'kOnExecute', {
    get: function () {
      // hack for backward compatibility
      compatMode0_12 = false;
      return 99;
    }
  });

var methods = httpParser.methods = HTTPParser.methods = [
  'DELETE',
  'GET',
  'HEAD',
  'POST',
  'PUT',
  'CONNECT',
  'OPTIONS',
  'TRACE',
  'COPY',
  'LOCK',
  'MKCOL',
  'MOVE',
  'PROPFIND',
  'PROPPATCH',
  'SEARCH',
  'UNLOCK',
  'BIND',
  'REBIND',
  'UNBIND',
  'ACL',
  'REPORT',
  'MKACTIVITY',
  'CHECKOUT',
  'MERGE',
  'M-SEARCH',
  'NOTIFY',
  'SUBSCRIBE',
  'UNSUBSCRIBE',
  'PATCH',
  'PURGE',
  'MKCALENDAR',
  'LINK',
  'UNLINK'
];
var method_connect = methods.indexOf('CONNECT');
HTTPParser.prototype.reinitialize = HTTPParser;
HTTPParser.prototype.close =
HTTPParser.prototype.pause =
HTTPParser.prototype.resume =
HTTPParser.prototype.free = function () {};
HTTPParser.prototype._compatMode0_11 = false;
HTTPParser.prototype.getAsyncId = function() { return 0; };

var headerState = {
  REQUEST_LINE: true,
  RESPONSE_LINE: true,
  HEADER: true
};
HTTPParser.prototype.execute = function (chunk, start, length) {
  if (!(this instanceof HTTPParser)) {
    throw new TypeError('not a HTTPParser');
  }

// backward compat to node < 0.11.4
  // Note: the start and length params were removed in newer version
  start = start || 0;
  length = typeof length === 'number' ? length : chunk.length;

this.chunk = chunk;
  this.offset = start;
  var end = this.end = start + length;
  try {
    while (this.offset < end) {
      if (this[this.state]()) {
        break;
      }
    }
  } catch (err) {
    if (this.isUserCall) {
      throw err;
    }
    this.hadError = true;
    return err;
  }
  this.chunk = null;
  length = this.offset - start;
  if (headerState[this.state]) {
    this.headerSize += length;
    if (this.headerSize > HTTPParser.maxHeaderSize) {
      return new Error('max header size exceeded');
    }
  }
  return length;
};

// These three methods are used for an internal speed optimization, and it also
// works if theses are noops. Basically consume() asks us to read the bytes
// ourselves, but if we don't do it we get them through execute().
HTTPParser.prototype.consume =
HTTPParser.prototype.unconsume =
HTTPParser.prototype.getCurrentBuffer = function () {};

//For correct error handling - see HTTPParser#execute
//Usage: this.userCall()(userFunction('arg'));
HTTPParser.prototype.userCall = function () {
  this.isUserCall = true;
  var self = this;
  return function (ret) {
    self.isUserCall = false;
    return ret;
  };
};

HTTPParser.prototype.nextRequest = function () {
  this.userCall()(this[kOnMessageComplete]());
  this.reinitialize(this.type);
};

HTTPParser.prototype.consumeLine = function () {
  var end = this.end,
      chunk = this.chunk;
  for (var i = this.offset; i < end; i++) {
    if (chunk[i] === 0x0a) { // \n
      var line = this.line + chunk.toString(HTTPParser.encoding, this.offset, i);
      if (line.charAt(line.length - 1) === '\r') {
        line = line.substr(0, line.length - 1);
      }
      this.line = '';
      this.offset = i + 1;
      return line;
    }
  }
  //line split over multiple chunks
  this.line += chunk.toString(HTTPParser.encoding, this.offset, this.end);
  this.offset = this.end;
};

var headerExp = /^([^: \t]+):[ \t]*((?:.*[^ \t])|)/;
var headerContinueExp = /^[ \t]+(.*[^ \t])/;
HTTPParser.prototype.parseHeader = function (line, headers) {
  if (line.indexOf('\r') !== -1) {
    throw parseErrorCode('HPE_LF_EXPECTED');
  }

HTTPParser.prototype.shouldKeepAlive = function () {
  if (this.info.versionMajor > 0 && this.info.versionMinor > 0) {
    if (this.connection.indexOf('close') !== -1) {
      return false;
    }
  } else if (this.connection.indexOf('keep-alive') === -1) {
    return false;
  }
  if (this.body_bytes !== null || this.isChunked) { // || skipBody
    return true;
  }
  return false;
};

HTTPParser.prototype.HEADER = function () {
  var line = this.consumeLine();
  if (line === undefined) {
    return;
  }
  var info = this.info;
  if (line) {
    this.parseHeader(line, info.headers);
  } else {
    var headers = info.headers;
    var hasContentLength = false;
    var currentContentLengthValue;
    var hasUpgradeHeader = false;
    for (var i = 0; i < headers.length; i += 2) {
      switch (headers[i].toLowerCase()) {
        case 'transfer-encoding':
          this.isChunked = headers[i + 1].toLowerCase() === 'chunked';
          break;
        case 'content-length':
          currentContentLengthValue = +headers[i + 1];
          if (hasContentLength) {
            // Fix duplicate Content-Length header with same values.
            // Throw error only if values are different.
            // Known issues:
            // https://github.com/request/request/issues/2091#issuecomment-328715113
            // https://github.com/nodejs/node/issues/6517#issuecomment-216263771
            if (currentContentLengthValue !== this.body_bytes) {
              throw parseErrorCode('HPE_UNEXPECTED_CONTENT_LENGTH');
            }
          } else {
            hasContentLength = true;
            this.body_bytes = currentContentLengthValue;
          }
          break;
        case 'connection':
          this.connection += headers[i + 1].toLowerCase();
          break;
        case 'upgrade':
          hasUpgradeHeader = true;
          break;
      }
    }

// if both isChunked and hasContentLength, isChunked wins
    // This is required so the body is parsed using the chunked method, and matches
    // Chrome's behavior.  We could, maybe, ignore them both (would get chunked
    // encoding into the body), and/or disable shouldKeepAlive to be more
    // resilient.
    if (this.isChunked && hasContentLength) {
      hasContentLength = false;
      this.body_bytes = null;
    }

// Logic from https://github.com/nodejs/http-parser/blob/921d5585515a153fa00e411cf144280c59b41f90/http_parser.c#L1727-L1737
    // "For responses, "Upgrade: foo" and "Connection: upgrade" are
    //   mandatory only when it is a 101 Switching Protocols response,
    //   otherwise it is purely informational, to announce support.
    if (hasUpgradeHeader && this.connection.indexOf('upgrade') != -1) {
      info.upgrade = this.type === HTTPParser.REQUEST || info.statusCode === 101;
    } else {
      info.upgrade = info.method === method_connect;
    }

if (this.isChunked && info.upgrade) {
      this.isChunked = false;
    }

info.shouldKeepAlive = this.shouldKeepAlive();
    //problem which also exists in original node: we should know skipBody before calling onHeadersComplete
    var skipBody;
    if (compatMode0_12) {
      skipBody = this.userCall()(this[kOnHeadersComplete](info));
    } else {
      skipBody = this.userCall()(this[kOnHeadersComplete](info.versionMajor,
          info.versionMinor, info.headers, info.method, info.url, info.statusCode,
          info.statusMessage, info.upgrade, info.shouldKeepAlive));
    }
    if (skipBody === 2) {
      this.nextRequest();
      return true;
    } else if (this.isChunked && !skipBody) {
      this.state = 'BODY_CHUNKHEAD';
    } else if (skipBody || this.body_bytes === 0) {
      this.nextRequest();
      // For older versions of node (v6.x and older?), that return skipBody=1 or skipBody=true,
      //   need this "return true;" if it's an upgrade request.
      return info.upgrade;
    } else if (this.body_bytes === null) {
      this.state = 'BODY_RAW';
    } else {
      this.state = 'BODY_SIZED';
    }
  }
};

HTTPParser.prototype.BODY_CHUNKHEAD = function () {
  var line = this.consumeLine();
  if (line === undefined) {
    return;
  }
  this.body_bytes = parseInt(line, 16);
  if (!this.body_bytes) {
    this.state = 'BODY_CHUNKTRAILERS';
  } else {
    this.state = 'BODY_CHUNK';
  }
};

HTTPParser.prototype.BODY_CHUNK = function () {
  var length = Math.min(this.end - this.offset, this.body_bytes);
  this.userCall()(this[kOnBody](this.chunk, this.offset, length));
  this.offset += length;
  this.body_bytes -= length;
  if (!this.body_bytes) {
    this.state = 'BODY_CHUNKEMPTYLINE';
  }
};

HTTPParser.prototype.BODY_CHUNKEMPTYLINE = function () {
  var line = this.consumeLine();
  if (line === undefined) {
    return;
  }
  assert.equal(line, '');
  this.state = 'BODY_CHUNKHEAD';
};

HTTPParser.prototype.BODY_CHUNKTRAILERS = function () {
  var line = this.consumeLine();
  if (line === undefined) {
    return;
  }
  if (line) {
    this.parseHeader(line, this.trailers);
  } else {
    if (this.trailers.length) {
      this.userCall()(this[kOnHeaders](this.trailers, ''));
    }
    this.nextRequest();
  }
};

HTTPParser.prototype.BODY_RAW = function () {
  var length = this.end - this.offset;
  this.userCall()(this[kOnBody](this.chunk, this.offset, length));
  this.offset = this.end;
};

HTTPParser.prototype.BODY_SIZED = function () {
  var length = Math.min(this.end - this.offset, this.body_bytes);
  this.userCall()(this[kOnBody](this.chunk, this.offset, length));
  this.offset += length;
  this.body_bytes -= length;
  if (!this.body_bytes) {
    this.nextRequest();
  }
};

// backward compat to node < 0.11.6
['Headers', 'HeadersComplete', 'Body', 'MessageComplete'].forEach(function (name) {
  var k = HTTPParser['kOn' + name];
  Object.defineProperty(HTTPParser.prototype, 'on' + name, {
    get: function () {
      return this[k];
    },
    set: function (to) {
      // hack for backward compatibility
      this._compatMode0_11 = true;
      method_connect = 'CONNECT';
      return (this[k] = to);
    }
  });
});

function parseErrorCode(code) {
  var err = new Error('Parse Error');
  err.code = code;
  return err;
}

var NodeHTTPParser = httpParser.HTTPParser,
    Buffer$7         = safeBuffer.exports.Buffer;

var TYPES = {
  request:  NodeHTTPParser.REQUEST  || 'request',
  response: NodeHTTPParser.RESPONSE || 'response'
};

var HttpParser$3 = function(type) {
  this._type     = type;
  this._parser   = new NodeHTTPParser(TYPES[type]);
  this._complete = false;
  this.headers   = {};

var current = null,
      self    = this;

this._parser.onHeaderField = function(b, start, length) {
    current = b.toString('utf8', start, start + length).toLowerCase();
  };

this._parser.onHeaderValue = function(b, start, length) {
    var value = b.toString('utf8', start, start + length);

if (self.headers.hasOwnProperty(current))
      self.headers[current] += ', ' + value;
    else
      self.headers[current] = value;
  };

this._parser.onHeadersComplete = this._parser[NodeHTTPParser.kOnHeadersComplete] =
  function(majorVersion, minorVersion, headers, method, pathname, statusCode) {
    var info = arguments[0];

if (typeof info === 'object') {
      method     = info.method;
      pathname   = info.url;
      statusCode = info.statusCode;
      headers    = info.headers;
    }

self.method     = (typeof method === 'number') ? HttpParser$3.METHODS[method] : method;
    self.statusCode = statusCode;
    self.url        = pathname;

if (!headers) return;

for (var i = 0, n = headers.length, key, value; i < n; i += 2) {
      key   = headers[i].toLowerCase();
      value = headers[i+1];
      if (self.headers.hasOwnProperty(key))
        self.headers[key] += ', ' + value;
      else
        self.headers[key] = value;
    }

self._complete = true;
  };
};

HttpParser$3.METHODS = {
  0:  'DELETE',
  1:  'GET',
  2:  'HEAD',
  3:  'POST',
  4:  'PUT',
  5:  'CONNECT',
  6:  'OPTIONS',
  7:  'TRACE',
  8:  'COPY',
  9:  'LOCK',
  10: 'MKCOL',
  11: 'MOVE',
  12: 'PROPFIND',
  13: 'PROPPATCH',
  14: 'SEARCH',
  15: 'UNLOCK',
  16: 'BIND',
  17: 'REBIND',
  18: 'UNBIND',
  19: 'ACL',
  20: 'REPORT',
  21: 'MKACTIVITY',
  22: 'CHECKOUT',
  23: 'MERGE',
  24: 'M-SEARCH',
  25: 'NOTIFY',
  26: 'SUBSCRIBE',
  27: 'UNSUBSCRIBE',
  28: 'PATCH',
  29: 'PURGE',
  30: 'MKCALENDAR',
  31: 'LINK',
  32: 'UNLINK'
};

var VERSION = process.version
  ? process.version.match(/[0-9]+/g).map(function(n) { return parseInt(n, 10) })
  : [];

if (VERSION[0] === 0 && VERSION[1] === 12) {
  HttpParser$3.METHODS[16] = 'REPORT';
  HttpParser$3.METHODS[17] = 'MKACTIVITY';
  HttpParser$3.METHODS[18] = 'CHECKOUT';
  HttpParser$3.METHODS[19] = 'MERGE';
  HttpParser$3.METHODS[20] = 'M-SEARCH';
  HttpParser$3.METHODS[21] = 'NOTIFY';
  HttpParser$3.METHODS[22] = 'SUBSCRIBE';
  HttpParser$3.METHODS[23] = 'UNSUBSCRIBE';
  HttpParser$3.METHODS[24] = 'PATCH';
  HttpParser$3.METHODS[25] = 'PURGE';
}

HttpParser$3.prototype.isComplete = function() {
  return this._complete;
};

HttpParser$3.prototype.parse = function(chunk) {
  var consumed = this._parser.execute(chunk, 0, chunk.length);

if (typeof consumed !== 'number') {
    this.error     = consumed;
    this._complete = true;
    return;
  }

if (this._complete)
    this.body = (consumed < chunk.length)
              ? chunk.slice(consumed)
              : Buffer$7.alloc(0);
};

var http_parser = HttpParser$3;

var TOKEN    = /([!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z]+)/,
    NOTOKEN  = /([^!#\$%&'\*\+\-\.\^_`\|~0-9A-Za-z])/g,
    QUOTED   = /"((?:\\[\x00-\x7f]|[^\x00-\x08\x0a-\x1f\x7f"\\])*)"/,
    PARAM    = new RegExp(TOKEN.source + '(?:=(?:' + TOKEN.source + '|' + QUOTED.source + '))?'),
    EXT      = new RegExp(TOKEN.source + '(?: *; *' + PARAM.source + ')*', 'g'),
    EXT_LIST = new RegExp('^' + EXT.source + '(?: *, *' + EXT.source + ')*$'),
    NUMBER   = /^-?(0|[1-9][0-9]*)(\.[0-9]+)?$/;

var hasOwnProperty = Object.prototype.hasOwnProperty;

var Parser$1 = {
  parseHeader: function(header) {
    var offers = new Offers();
    if (header === '' || header === undefined) return offers;

if (!EXT_LIST.test(header))
      throw new SyntaxError('Invalid Sec-WebSocket-Extensions header: ' + header);

var values = header.match(EXT);

values.forEach(function(value) {
      var params = value.match(new RegExp(PARAM.source, 'g')),
          name   = params.shift(),
          offer  = {};

params.forEach(function(param) {
        var args = param.match(PARAM), key = args[1], data;

if (args[2] !== undefined) {
          data = args[2];
        } else if (args[3] !== undefined) {
          data = args[3].replace(/\\/g, '');
        } else {
          data = true;
        }
        if (NUMBER.test(data)) data = parseFloat(data);

if (hasOwnProperty.call(offer, key)) {
          offer[key] = [].concat(offer[key]);
          offer[key].push(data);
        } else {
          offer[key] = data;
        }
      }, this);
      offers.push(name, offer);
    }, this);

return offers;
  },

serializeParams: function(name, params) {
    var values = [];

for (var key in params) print(key, params[key]);

return [name].concat(values).join('; ');
  }
};

var Offers = function() {
  this._byName  = {};
  this._inOrder = [];
};

Offers.prototype.push = function(name, params) {
  if (!hasOwnProperty.call(this._byName, name))
    this._byName[name] = [];

this._byName[name].push(params);
  this._inOrder.push({ name: name, params: params });
};

Offers.prototype.eachOffer = function(callback, context) {
  var list = this._inOrder;
  for (var i = 0, n = list.length; i < n; i++)
    callback.call(context, list[i].name, list[i].params);
};

Offers.prototype.byName = function(name) {
  return this._byName[name] || [];
};

Offers.prototype.toArray = function() {
  return this._inOrder.slice();
};

var parser = Parser$1;

var RingBuffer$2 = function(bufferSize) {
  this._bufferSize = bufferSize;
  this.clear();
};

RingBuffer$2.prototype.clear = function() {
  this._buffer     = new Array(this._bufferSize);
  this._ringOffset = 0;
  this._ringSize   = this._bufferSize;
  this._head       = 0;
  this._tail       = 0;
  this.length      = 0;
};

RingBuffer$2.prototype.push = function(value) {
  var expandBuffer = false,
      expandRing   = false;

if (this._ringSize < this._bufferSize) {
    expandBuffer = (this._tail === 0);
  } else if (this._ringOffset === this._ringSize) {
    expandBuffer = true;
    expandRing   = (this._tail === 0);
  }

if (expandBuffer) {
    this._tail       = this._bufferSize;
    this._buffer     = this._buffer.concat(new Array(this._bufferSize));
    this._bufferSize = this._buffer.length;

if (expandRing)
      this._ringSize = this._bufferSize;
  }

this._buffer[this._tail] = value;
  this.length += 1;
  if (this._tail < this._ringSize) this._ringOffset += 1;
  this._tail = (this._tail + 1) % this._bufferSize;
};

RingBuffer$2.prototype.peek = function() {
  if (this.length === 0) return void 0;
  return this._buffer[this._head];
};

RingBuffer$2.prototype.shift = function() {
  if (this.length === 0) return void 0;

var value = this._buffer[this._head];
  this._buffer[this._head] = void 0;
  this.length -= 1;
  this._ringOffset -= 1;

if (this._ringOffset === 0 && this.length > 0) {
    this._head       = this._ringSize;
    this._ringOffset = this.length;
    this._ringSize   = this._bufferSize;
  } else {
    this._head = (this._head + 1) % this._ringSize;
  }
  return value;
};

var ring_buffer = RingBuffer$2;

var RingBuffer$1 = ring_buffer;

var Functor$1 = function(session, method) {
  this._session = session;
  this._method  = method;
  this._queue   = new RingBuffer$1(Functor$1.QUEUE_SIZE);
  this._stopped = false;
  this.pending  = 0;
};

Functor$1.QUEUE_SIZE = 8;

Functor$1.prototype.call = function(error, message, callback, context) {
  if (this._stopped) return;

var record = { error: error, message: message, callback: callback, context: context, done: false },
      called = false,
      self   = this;

this._queue.push(record);

if (record.error) {
    record.done = true;
    this._stop();
    return this._flushQueue();
  }

var handler = function(err, msg) {
    if (!(called ^ (called = true))) return;

if (err) {
      self._stop();
      record.error   = err;
      record.message = null;
    } else {
      record.message = msg;
    }

record.done = true;
    self._flushQueue();
  };

try {
    this._session[this._method](message, handler);
  } catch (err) {
    handler(err);
  }
};

Functor$1.prototype._stop = function() {
  this.pending  = this._queue.length;
  this._stopped = true;
};

Functor$1.prototype._flushQueue = function() {
  var queue = this._queue, record;

while (queue.length > 0 && queue.peek().done) {
    record = queue.shift();
    if (record.error) {
      this.pending = 0;
      queue.clear();
    } else {
      this.pending -= 1;
    }
    record.callback.call(record.context, record.error, record.message);
  }
};

var functor = Functor$1;

var RingBuffer = ring_buffer;

var Pledge$2 = function() {
  this._complete  = false;
  this._callbacks = new RingBuffer(Pledge$2.QUEUE_SIZE);
};

Pledge$2.QUEUE_SIZE = 4;

Pledge$2.all = function(list) {
  var pledge  = new Pledge$2(),
      pending = list.length,
      n       = pending;

if (pending === 0) pledge.done();

while (n--) list[n].then(function() {
    pending -= 1;
    if (pending === 0) pledge.done();
  });
  return pledge;
};

Pledge$2.prototype.then = function(callback) {
  if (this._complete) callback();
  else this._callbacks.push(callback);
};

Pledge$2.prototype.done = function() {
  this._complete = true;
  var callbacks = this._callbacks, callback;
  while (callback = callbacks.shift()) callback();
};

var pledge = Pledge$2;

var Functor = functor,
    Pledge$1  = pledge;

var Cell$1 = function(tuple) {
  this._ext     = tuple[0];
  this._session = tuple[1];

this._functors = {
    incoming: new Functor(this._session, 'processIncomingMessage'),
    outgoing: new Functor(this._session, 'processOutgoingMessage')
  };
};

Cell$1.prototype.pending = function(direction) {
  var functor = this._functors[direction];
  if (!functor._stopped) functor.pending += 1;
};

Cell$1.prototype.incoming = function(error, message, callback, context) {
  this._exec('incoming', error, message, callback, context);
};

Cell$1.prototype.outgoing = function(error, message, callback, context) {
  this._exec('outgoing', error, message, callback, context);
};

Cell$1.prototype.close = function() {
  this._closed = this._closed || new Pledge$1();
  this._doClose();
  return this._closed;
};

Cell$1.prototype._exec = function(direction, error, message, callback, context) {
  this._functors[direction].call(error, message, function(err, msg) {
    if (err) err.message = this._ext.name + ': ' + err.message;
    callback.call(context, err, msg);
    this._doClose();
  }, this);
};

Cell$1.prototype._doClose = function() {
  var fin  = this._functors.incoming,
      fout = this._functors.outgoing;

if (!this._closed || fin.pending + fout.pending !== 0) return;
  if (this._session) this._session.close();
  this._session = null;
  this._closed.done();
};

var cell = Cell$1;

var Cell   = cell,
    Pledge = pledge;

var Pipeline$1 = function(sessions) {
  this._cells   = sessions.map(function(session) { return new Cell(session) });
  this._stopped = { incoming: false, outgoing: false };
};

Pipeline$1.prototype.processIncomingMessage = function(message, callback, context) {
  if (this._stopped.incoming) return;
  this._loop('incoming', this._cells.length - 1, -1, -1, message, callback, context);
};

Pipeline$1.prototype.processOutgoingMessage = function(message, callback, context) {
  if (this._stopped.outgoing) return;
  this._loop('outgoing', 0, this._cells.length, 1, message, callback, context);
};

Pipeline$1.prototype.close = function(callback, context) {
  this._stopped = { incoming: true, outgoing: true };

var closed = this._cells.map(function(a) { return a.close() });
  if (callback)
    Pledge.all(closed).then(function() { callback.call(context); });
};

Pipeline$1.prototype._loop = function(direction, start, end, step, message, callback, context) {
  var cells = this._cells,
      n     = cells.length,
      self  = this;

while (n--) cells[n].pending(direction);

var pipe = function(index, error, msg) {
    if (index === end) return callback.call(context, error, msg);

cells[index][direction](error, msg, function(err, m) {
      if (err) self._stopped[direction] = true;
      pipe(index + step, err, m);
    });
  };
  pipe(start, null, message);
};

var pipeline = Pipeline$1;

var Parser   = parser,
    Pipeline = pipeline;

var Extensions$1 = function() {
  this._rsv1 = this._rsv2 = this._rsv3 = null;

this._byName   = {};
  this._inOrder  = [];
  this._sessions = [];
  this._index    = {};
};

Extensions$1.MESSAGE_OPCODES = [1, 2];

var instance$a = {
  add: function(ext) {
    if (typeof ext.name !== 'string') throw new TypeError('extension.name must be a string');
    if (ext.type !== 'permessage') throw new TypeError('extension.type must be "permessage"');

if (typeof ext.rsv1 !== 'boolean') throw new TypeError('extension.rsv1 must be true or false');
    if (typeof ext.rsv2 !== 'boolean') throw new TypeError('extension.rsv2 must be true or false');
    if (typeof ext.rsv3 !== 'boolean') throw new TypeError('extension.rsv3 must be true or false');

if (this._byName.hasOwnProperty(ext.name))
      throw new TypeError('An extension with name "' + ext.name + '" is already registered');

this._byName[ext.name] = ext;
    this._inOrder.push(ext);
  },

generateOffer: function() {
    var sessions = [],
        offer    = [],
        index    = {};

this._inOrder.forEach(function(ext) {
      var session = ext.createClientSession();
      if (!session) return;

var record = [ext, session];
      sessions.push(record);
      index[ext.name] = record;

var offers = session.generateOffer();
      offers = offers ? [].concat(offers) : [];

offers.forEach(function(off) {
        offer.push(Parser.serializeParams(ext.name, off));
      }, this);
    }, this);

this._sessions = sessions;
    this._index    = index;

return offer.length > 0 ? offer.join(', ') : null;
  },

activate: function(header) {
    var responses = Parser.parseHeader(header),
        sessions  = [];

responses.eachOffer(function(name, params) {
      var record = this._index[name];

if (!record)
        throw new Error('Server sent an extension response for unknown extension "' + name + '"');

var ext      = record[0],
          session  = record[1],
          reserved = this._reserved(ext);

if (reserved)
        throw new Error('Server sent two extension responses that use the RSV' +
                        reserved[0] + ' bit: "' +
                        reserved[1] + '" and "' + ext.name + '"');

if (session.activate(params) !== true)
        throw new Error('Server sent unacceptable extension parameters: ' +
                        Parser.serializeParams(name, params));

this._reserve(ext);
      sessions.push(record);
    }, this);

this._sessions = sessions;
    this._pipeline = new Pipeline(sessions);
  },

generateResponse: function(header) {
    var sessions = [],
        response = [],
        offers   = Parser.parseHeader(header);

this._inOrder.forEach(function(ext) {
      var offer = offers.byName(ext.name);
      if (offer.length === 0 || this._reserved(ext)) return;

var session = ext.createServerSession(offer);
      if (!session) return;

this._reserve(ext);
      sessions.push([ext, session]);
      response.push(Parser.serializeParams(ext.name, session.generateResponse()));
    }, this);

this._sessions = sessions;
    this._pipeline = new Pipeline(sessions);

return response.length > 0 ? response.join(', ') : null;
  },

validFrameRsv: function(frame) {
    var allowed = { rsv1: false, rsv2: false, rsv3: false },
        ext;

if (Extensions$1.MESSAGE_OPCODES.indexOf(frame.opcode) >= 0) {
      for (var i = 0, n = this._sessions.length; i < n; i++) {
        ext = this._sessions[i][0];
        allowed.rsv1 = allowed.rsv1 || ext.rsv1;
        allowed.rsv2 = allowed.rsv2 || ext.rsv2;
        allowed.rsv3 = allowed.rsv3 || ext.rsv3;
      }
    }

return (allowed.rsv1 || !frame.rsv1) &&
           (allowed.rsv2 || !frame.rsv2) &&
           (allowed.rsv3 || !frame.rsv3);
  },

processIncomingMessage: function(message, callback, context) {
    this._pipeline.processIncomingMessage(message, callback, context);
  },

processOutgoingMessage: function(message, callback, context) {
    this._pipeline.processOutgoingMessage(message, callback, context);
  },

close: function(callback, context) {
    if (!this._pipeline) return callback.call(context);
    this._pipeline.close(callback, context);
  },

_reserve: function(ext) {
    this._rsv1 = this._rsv1 || (ext.rsv1 && ext.name);
    this._rsv2 = this._rsv2 || (ext.rsv2 && ext.name);
    this._rsv3 = this._rsv3 || (ext.rsv3 && ext.name);
  },

_reserved: function(ext) {
    if (this._rsv1 && ext.rsv1) return [1, this._rsv1];
    if (this._rsv2 && ext.rsv2) return [2, this._rsv2];
    if (this._rsv3 && ext.rsv3) return [3, this._rsv3];
    return false;
  }
};

for (var key$a in instance$a)
  Extensions$1.prototype[key$a] = instance$a[key$a];

var websocket_extensions = Extensions$1;

var Frame$1 = function() {};

var instance$9 = {
  final:        false,
  rsv1:         false,
  rsv2:         false,
  rsv3:         false,
  opcode:       null,
  masked:       false,
  maskingKey:   null,
  lengthBytes:  1,
  length:       0,
  payload:      null
};

for (var key$9 in instance$9)
  Frame$1.prototype[key$9] = instance$9[key$9];

var frame = Frame$1;

var Buffer$6 = safeBuffer.exports.Buffer;

var Message$1 = function() {
  this.rsv1    = false;
  this.rsv2    = false;
  this.rsv3    = false;
  this.opcode  = null;
  this.length  = 0;
  this._chunks = [];
};

var instance$8 = {
  read: function() {
    return this.data = this.data || Buffer$6.concat(this._chunks, this.length);
  },

pushFrame: function(frame) {
    this.rsv1 = this.rsv1 || frame.rsv1;
    this.rsv2 = this.rsv2 || frame.rsv2;
    this.rsv3 = this.rsv3 || frame.rsv3;

if (this.opcode === null) this.opcode = frame.opcode;

this._chunks.push(frame.payload);
    this.length += frame.length;
  }
};

for (var key$8 in instance$8)
  Message$1.prototype[key$8] = instance$8[key$8];

var message = Message$1;

var Buffer$5     = safeBuffer.exports.Buffer,
    crypto$2     = require$$1__default$1["default"],
    util$a       = require$$2__default["default"],
    Extensions = websocket_extensions,
    Base$6       = base,
    Frame      = frame,
    Message    = message;

var Hybi$2 = function(request, url, options) {
  Base$6.apply(this, arguments);

this._extensions     = new Extensions();
  this._stage          = 0;
  this._masking        = this._options.masking;
  this._protocols      = this._options.protocols || [];
  this._requireMasking = this._options.requireMasking;
  this._pingCallbacks  = {};

if (typeof this._protocols === 'string')
    this._protocols = this._protocols.split(/ *, */);

if (!this._request) return;

var protos    = this._request.headers['sec-websocket-protocol'],
      supported = this._protocols;

if (protos !== undefined) {
    if (typeof protos === 'string') protos = protos.split(/ *, */);
    this.protocol = protos.filter(function(p) { return supported.indexOf(p) >= 0 })[0];
  }

this.version = 'hybi-' + Hybi$2.VERSION;
};
util$a.inherits(Hybi$2, Base$6);

Hybi$2.VERSION = '13';

Hybi$2.mask = function(payload, mask, offset) {
  if (!mask || mask.length === 0) return payload;
  offset = offset || 0;

for (var i = 0, n = payload.length - offset; i < n; i++) {
    payload[offset + i] = payload[offset + i] ^ mask[i % 4];
  }
  return payload;
};

Hybi$2.generateAccept = function(key) {
  var sha1 = crypto$2.createHash('sha1');
  sha1.update(key + Hybi$2.GUID);
  return sha1.digest('base64');
};

Hybi$2.GUID = '258EAFA5-E914-47DA-95CA-C5AB0DC85B11';

var instance$7 = {
  FIN:    0x80,
  MASK:   0x80,
  RSV1:   0x40,
  RSV2:   0x20,
  RSV3:   0x10,
  OPCODE: 0x0F,
  LENGTH: 0x7F,

OPCODES: {
    continuation: 0,
    text:         1,
    binary:       2,
    close:        8,
    ping:         9,
    pong:         10
  },

OPCODE_CODES:    [0, 1, 2, 8, 9, 10],
  MESSAGE_OPCODES: [0, 1, 2],
  OPENING_OPCODES: [1, 2],

ERRORS: {
    normal_closure:       1000,
    going_away:           1001,
    protocol_error:       1002,
    unacceptable:         1003,
    encoding_error:       1007,
    policy_violation:     1008,
    too_large:            1009,
    extension_error:      1010,
    unexpected_condition: 1011
  },

ERROR_CODES:        [1000, 1001, 1002, 1003, 1007, 1008, 1009, 1010, 1011],
  DEFAULT_ERROR_CODE: 1000,
  MIN_RESERVED_ERROR: 3000,
  MAX_RESERVED_ERROR: 4999,

// http://www.w3.org/International/questions/qa-forms-utf-8.en.php
  UTF8_MATCH: /^([\x00-\x7F]|[\xC2-\xDF][\x80-\xBF]|\xE0[\xA0-\xBF][\x80-\xBF]|[\xE1-\xEC\xEE\xEF][\x80-\xBF]{2}|\xED[\x80-\x9F][\x80-\xBF]|\xF0[\x90-\xBF][\x80-\xBF]{2}|[\xF1-\xF3][\x80-\xBF]{3}|\xF4[\x80-\x8F][\x80-\xBF]{2})*$/,

addExtension: function(extension) {
    this._extensions.add(extension);
    return true;
  },

parse: function(chunk) {
    this._reader.put(chunk);
    var buffer = true;
    while (buffer) {
      switch (this._stage) {
        case 0:
          buffer = this._reader.read(1);
          if (buffer) this._parseOpcode(buffer[0]);
          break;

case 1:
          buffer = this._reader.read(1);
          if (buffer) this._parseLength(buffer[0]);
          break;

case 2:
          buffer = this._reader.read(this._frame.lengthBytes);
          if (buffer) this._parseExtendedLength(buffer);
          break;

case 3:
          buffer = this._reader.read(4);
          if (buffer) {
            this._stage = 4;
            this._frame.maskingKey = buffer;
          }
          break;

case 4:
          buffer = this._reader.read(this._frame.length);
          if (buffer) {
            this._stage = 0;
            this._emitFrame(buffer);
          }
          break;

default:
          buffer = null;
      }
    }
  },

text: function(message) {
    if (this.readyState > 1) return false;
    return this.frame(message, 'text');
  },

binary: function(message) {
    if (this.readyState > 1) return false;
    return this.frame(message, 'binary');
  },

ping: function(message, callback) {
    if (this.readyState > 1) return false;
    message = message || '';
    if (callback) this._pingCallbacks[message] = callback;
    return this.frame(message, 'ping');
  },

pong: function(message) {
      if (this.readyState > 1) return false;
      message = message ||'';
      return this.frame(message, 'pong');
  },

close: function(reason, code) {
    reason = reason || '';
    code   = code   || this.ERRORS.normal_closure;

if (this.readyState <= 0) {
      this.readyState = 3;
      this.emit('close', new Base$6.CloseEvent(code, reason));
      return true;
    } else if (this.readyState === 1) {
      this.readyState = 2;
      this._extensions.close(function() { this.frame(reason, 'close', code); }, this);
      return true;
    } else {
      return false;
    }
  },

frame: function(buffer, type, code) {
    if (this.readyState <= 0) return this._queue([buffer, type, code]);
    if (this.readyState > 2) return false;

if (buffer instanceof Array)    buffer = Buffer$5.from(buffer);
    if (typeof buffer === 'number') buffer = buffer.toString();

var message = new Message(),
        isText  = (typeof buffer === 'string'),
        payload, copy;

message.rsv1   = message.rsv2 = message.rsv3 = false;
    message.opcode = this.OPCODES[type || (isText ? 'text' : 'binary')];

payload = isText ? Buffer$5.from(buffer, 'utf8') : buffer;

if (code) {
      copy = payload;
      payload = Buffer$5.allocUnsafe(2 + copy.length);
      payload.writeUInt16BE(code, 0);
      copy.copy(payload, 2);
    }
    message.data = payload;

var onMessageReady = function(message) {
      var frame = new Frame();

frame.final   = true;
      frame.rsv1    = message.rsv1;
      frame.rsv2    = message.rsv2;
      frame.rsv3    = message.rsv3;
      frame.opcode  = message.opcode;
      frame.masked  = !!this._masking;
      frame.length  = message.data.length;
      frame.payload = message.data;

if (frame.masked) frame.maskingKey = crypto$2.randomBytes(4);

this._sendFrame(frame);
    };

if (this.MESSAGE_OPCODES.indexOf(message.opcode) >= 0)
      this._extensions.processOutgoingMessage(message, function(error, message) {
        if (error) return this._fail('extension_error', error.message);
        onMessageReady.call(this, message);
      }, this);
    else
      onMessageReady.call(this, message);

return true;
  },

_sendFrame: function(frame) {
    var length = frame.length,
        header = (length <= 125) ? 2 : (length <= 65535 ? 4 : 10),
        offset = header + (frame.masked ? 4 : 0),
        buffer = Buffer$5.allocUnsafe(offset + length),
        masked = frame.masked ? this.MASK : 0;

buffer[0] = (frame.final ? this.FIN : 0) |
                (frame.rsv1 ? this.RSV1 : 0) |
                (frame.rsv2 ? this.RSV2 : 0) |
                (frame.rsv3 ? this.RSV3 : 0) |
                frame.opcode;

if (length <= 125) {
      buffer[1] = masked | length;
    } else if (length <= 65535) {
      buffer[1] = masked | 126;
      buffer.writeUInt16BE(length, 2);
    } else {
      buffer[1] = masked | 127;
      buffer.writeUInt32BE(Math.floor(length / 0x100000000), 2);
      buffer.writeUInt32BE(length % 0x100000000, 6);
    }

frame.payload.copy(buffer, offset);

if (frame.masked) {
      frame.maskingKey.copy(buffer, header);
      Hybi$2.mask(buffer, frame.maskingKey, offset);
    }

this._write(buffer);
  },

_handshakeResponse: function() {
    var secKey  = this._request.headers['sec-websocket-key'],
        version = this._request.headers['sec-websocket-version'];

if (version !== Hybi$2.VERSION)
      throw new Error('Unsupported WebSocket version: ' + version);

if (typeof secKey !== 'string')
      throw new Error('Missing handshake request header: Sec-WebSocket-Key');

this._headers.set('Upgrade', 'websocket');
    this._headers.set('Connection', 'Upgrade');
    this._headers.set('Sec-WebSocket-Accept', Hybi$2.generateAccept(secKey));

if (this.protocol) this._headers.set('Sec-WebSocket-Protocol', this.protocol);

var extensions = this._extensions.generateResponse(this._request.headers['sec-websocket-extensions']);
    if (extensions) this._headers.set('Sec-WebSocket-Extensions', extensions);

var start   = 'HTTP/1.1 101 Switching Protocols',
        headers = [start, this._headers.toString(), ''];

return Buffer$5.from(headers.join('\r\n'), 'utf8');
  },

_shutdown: function(code, reason, error) {
    delete this._frame;
    delete this._message;
    this._stage = 5;

var sendCloseFrame = (this.readyState === 1);
    this.readyState = 2;

this._extensions.close(function() {
      if (sendCloseFrame) this.frame(reason, 'close', code);
      this.readyState = 3;
      if (error) this.emit('error', new Error(reason));
      this.emit('close', new Base$6.CloseEvent(code, reason));
    }, this);
  },

_fail: function(type, message) {
    if (this.readyState > 1) return;
    this._shutdown(this.ERRORS[type], message, true);
  },

_parseOpcode: function(octet) {
    var rsvs = [this.RSV1, this.RSV2, this.RSV3].map(function(rsv) {
      return (octet & rsv) === rsv;
    });

var frame = this._frame = new Frame();

frame.final  = (octet & this.FIN) === this.FIN;
    frame.rsv1   = rsvs[0];
    frame.rsv2   = rsvs[1];
    frame.rsv3   = rsvs[2];
    frame.opcode = (octet & this.OPCODE);

this._stage = 1;

if (!this._extensions.validFrameRsv(frame))
      return this._fail('protocol_error',
          'One or more reserved bits are on: reserved1 = ' + (frame.rsv1 ? 1 : 0) +
          ', reserved2 = ' + (frame.rsv2 ? 1 : 0) +
          ', reserved3 = ' + (frame.rsv3 ? 1 : 0));

if (this.OPCODE_CODES.indexOf(frame.opcode) < 0)
      return this._fail('protocol_error', 'Unrecognized frame opcode: ' + frame.opcode);

if (this.MESSAGE_OPCODES.indexOf(frame.opcode) < 0 && !frame.final)
      return this._fail('protocol_error', 'Received fragmented control frame: opcode = ' + frame.opcode);

if (this._message && this.OPENING_OPCODES.indexOf(frame.opcode) >= 0)
      return this._fail('protocol_error', 'Received new data frame but previous continuous frame is unfinished');
  },

_parseLength: function(octet) {
    var frame = this._frame;
    frame.masked = (octet & this.MASK) === this.MASK;
    frame.length = (octet & this.LENGTH);

if (frame.length >= 0 && frame.length <= 125) {
      this._stage = frame.masked ? 3 : 4;
      if (!this._checkFrameLength()) return;
    } else {
      this._stage = 2;
      frame.lengthBytes = (frame.length === 126 ? 2 : 8);
    }

if (this._requireMasking && !frame.masked)
      return this._fail('unacceptable', 'Received unmasked frame but masking is required');
  },

_parseExtendedLength: function(buffer) {
    var frame = this._frame;
    frame.length = this._readUInt(buffer);

this._stage = frame.masked ? 3 : 4;

if (this.MESSAGE_OPCODES.indexOf(frame.opcode) < 0 && frame.length > 125)
      return this._fail('protocol_error', 'Received control frame having too long payload: ' + frame.length);

if (!this._checkFrameLength()) return;
  },

_checkFrameLength: function() {
    var length = this._message ? this._message.length : 0;

if (length + this._frame.length > this._maxLength) {
      this._fail('too_large', 'WebSocket frame length too large');
      return false;
    } else {
      return true;
    }
  },

_emitFrame: function(buffer) {
    var frame   = this._frame,
        payload = frame.payload = Hybi$2.mask(buffer, frame.maskingKey),
        opcode  = frame.opcode,
        message,
        code, reason,
        callbacks, callback;

delete this._frame;

if (opcode === this.OPCODES.continuation) {
      if (!this._message) return this._fail('protocol_error', 'Received unexpected continuation frame');
      this._message.pushFrame(frame);
    }

if (opcode === this.OPCODES.text || opcode === this.OPCODES.binary) {
      this._message = new Message();
      this._message.pushFrame(frame);
    }

if (frame.final && this.MESSAGE_OPCODES.indexOf(opcode) >= 0)
      return this._emitMessage(this._message);

if (opcode === this.OPCODES.close) {
      code   = (payload.length >= 2) ? payload.readUInt16BE(0) : null;
      reason = (payload.length > 2) ? this._encode(payload.slice(2)) : null;

if (!(payload.length === 0) &&
          !(code !== null && code >= this.MIN_RESERVED_ERROR && code <= this.MAX_RESERVED_ERROR) &&
          this.ERROR_CODES.indexOf(code) < 0)
        code = this.ERRORS.protocol_error;

if (payload.length > 125 || (payload.length > 2 && !reason))
        code = this.ERRORS.protocol_error;

this._shutdown(code || this.DEFAULT_ERROR_CODE, reason || '');
    }

if (opcode === this.OPCODES.ping) {
      this.frame(payload, 'pong');
      this.emit('ping', new Base$6.PingEvent(payload.toString()));
    }

if (opcode === this.OPCODES.pong) {
      callbacks = this._pingCallbacks;
      message   = this._encode(payload);
      callback  = callbacks[message];

delete callbacks[message];
      if (callback) callback();

this.emit('pong', new Base$6.PongEvent(payload.toString()));
    }
  },

_emitMessage: function(message) {
    var message = this._message;
    message.read();

delete this._message;

this._extensions.processIncomingMessage(message, function(error, message) {
      if (error) return this._fail('extension_error', error.message);

var payload = message.data;
      if (message.opcode === this.OPCODES.text) payload = this._encode(payload);

if (payload === null)
        return this._fail('encoding_error', 'Could not decode a text frame as UTF-8');
      else
        this.emit('message', new Base$6.MessageEvent(payload));
    }, this);
  },

_encode: function(buffer) {
    try {
      var string = buffer.toString('binary', 0, buffer.length);
      if (!this.UTF8_MATCH.test(string)) return null;
    } catch (e) {}
    return buffer.toString('utf8', 0, buffer.length);
  },

_readUInt: function(buffer) {
    if (buffer.length === 2) return buffer.readUInt16BE(0);

return buffer.readUInt32BE(0) * 0x100000000 +
           buffer.readUInt32BE(4);
  }
};

for (var key$7 in instance$7)
  Hybi$2.prototype[key$7] = instance$7[key$7];

var hybi = Hybi$2;

var Buffer$4     = safeBuffer.exports.Buffer,
    Stream$2     = require$$0__default$1["default"].Stream,
    url$2        = require$$2__default$1["default"],
    util$9       = require$$2__default["default"],
    Base$5       = base,
    Headers$1    = headers,
    HttpParser$2 = http_parser;

var PORTS = { 'ws:': 80, 'wss:': 443 };

var Proxy$1 = function(client, origin, options) {
  this._client  = client;
  this._http    = new HttpParser$2('response');
  this._origin  = (typeof client.url === 'object') ? client.url : url$2.parse(client.url);
  this._url     = (typeof origin === 'object') ? origin : url$2.parse(origin);
  this._options = options || {};
  this._state   = 0;

this.readable = this.writable = true;
  this._paused  = false;

this._headers = new Headers$1();
  this._headers.set('Host', this._origin.host);
  this._headers.set('Connection', 'keep-alive');
  this._headers.set('Proxy-Connection', 'keep-alive');

var auth = this._url.auth && Buffer$4.from(this._url.auth, 'utf8').toString('base64');
  if (auth) this._headers.set('Proxy-Authorization', 'Basic ' + auth);
};
util$9.inherits(Proxy$1, Stream$2);

var instance$6 = {
  setHeader: function(name, value) {
    if (this._state !== 0) return false;
    this._headers.set(name, value);
    return true;
  },

start: function() {
    if (this._state !== 0) return false;
    this._state = 1;

var origin = this._origin,
        port   = origin.port || PORTS[origin.protocol],
        start  = 'CONNECT ' + origin.hostname + ':' + port + ' HTTP/1.1';

var headers = [start, this._headers.toString(), ''];

this.emit('data', Buffer$4.from(headers.join('\r\n'), 'utf8'));
    return true;
  },

pause: function() {
    this._paused = true;
  },

resume: function() {
    this._paused = false;
    this.emit('drain');
  },

write: function(chunk) {
    if (!this.writable) return false;

this._http.parse(chunk);
    if (!this._http.isComplete()) return !this._paused;

this.statusCode = this._http.statusCode;
    this.headers    = this._http.headers;

if (this.statusCode === 200) {
      this.emit('connect', new Base$5.ConnectEvent());
    } else {
      var message = "Can't establish a connection to the server at " + this._origin.href;
      this.emit('error', new Error(message));
    }
    this.end();
    return !this._paused;
  },

end: function(chunk) {
    if (!this.writable) return;
    if (chunk !== undefined) this.write(chunk);
    this.readable = this.writable = false;
    this.emit('close');
    this.emit('end');
  },

destroy: function() {
    this.end();
  }
};

for (var key$6 in instance$6)
  Proxy$1.prototype[key$6] = instance$6[key$6];

var proxy = Proxy$1;

var Buffer$3     = safeBuffer.exports.Buffer,
    crypto$1     = require$$1__default$1["default"],
    url$1        = require$$2__default$1["default"],
    util$8       = require$$2__default["default"],
    HttpParser$1 = http_parser,
    Base$4       = base,
    Hybi$1       = hybi,
    Proxy      = proxy;

var Client$2 = function(_url, options) {
  this.version = 'hybi-' + Hybi$1.VERSION;
  Hybi$1.call(this, null, _url, options);

this.readyState = -1;
  this._key       = Client$2.generateKey();
  this._accept    = Hybi$1.generateAccept(this._key);
  this._http      = new HttpParser$1('response');

var uri  = url$1.parse(this.url),
      auth = uri.auth && Buffer$3.from(uri.auth, 'utf8').toString('base64');

if (this.VALID_PROTOCOLS.indexOf(uri.protocol) < 0)
    throw new Error(this.url + ' is not a valid WebSocket URL');

this._pathname = (uri.pathname || '/') + (uri.search || '');

this._headers.set('Host', uri.host);
  this._headers.set('Upgrade', 'websocket');
  this._headers.set('Connection', 'Upgrade');
  this._headers.set('Sec-WebSocket-Key', this._key);
  this._headers.set('Sec-WebSocket-Version', Hybi$1.VERSION);

if (this._protocols.length > 0)
    this._headers.set('Sec-WebSocket-Protocol', this._protocols.join(', '));

if (auth)
    this._headers.set('Authorization', 'Basic ' + auth);
};
util$8.inherits(Client$2, Hybi$1);

Client$2.generateKey = function() {
  return crypto$1.randomBytes(16).toString('base64');
};

var instance$5 = {
  VALID_PROTOCOLS: ['ws:', 'wss:'],

proxy: function(origin, options) {
    return new Proxy(this, origin, options);
  },

start: function() {
    if (this.readyState !== -1) return false;
    this._write(this._handshakeRequest());
    this.readyState = 0;
    return true;
  },

parse: function(chunk) {
    if (this.readyState === 3) return;
    if (this.readyState > 0) return Hybi$1.prototype.parse.call(this, chunk);

this._http.parse(chunk);
    if (!this._http.isComplete()) return;

this._validateHandshake();
    if (this.readyState === 3) return;

this._open();
    this.parse(this._http.body);
  },

_handshakeRequest: function() {
    var extensions = this._extensions.generateOffer();
    if (extensions)
      this._headers.set('Sec-WebSocket-Extensions', extensions);

var start   = 'GET ' + this._pathname + ' HTTP/1.1',
        headers = [start, this._headers.toString(), ''];

return Buffer$3.from(headers.join('\r\n'), 'utf8');
  },

_failHandshake: function(message) {
    message = 'Error during WebSocket handshake: ' + message;
    this.readyState = 3;
    this.emit('error', new Error(message));
    this.emit('close', new Base$4.CloseEvent(this.ERRORS.protocol_error, message));
  },

_validateHandshake: function() {
    this.statusCode = this._http.statusCode;
    this.headers    = this._http.headers;

if (this._http.error)
      return this._failHandshake(this._http.error.message);

if (this._http.statusCode !== 101)
      return this._failHandshake('Unexpected response code: ' + this._http.statusCode);

var headers    = this._http.headers,
        upgrade    = headers['upgrade'] || '',
        connection = headers['connection'] || '',
        accept     = headers['sec-websocket-accept'] || '',
        protocol   = headers['sec-websocket-protocol'] || '';

if (upgrade === '')
      return this._failHandshake("'Upgrade' header is missing");
    if (upgrade.toLowerCase() !== 'websocket')
      return this._failHandshake("'Upgrade' header value is not 'WebSocket'");

if (connection === '')
      return this._failHandshake("'Connection' header is missing");
    if (connection.toLowerCase() !== 'upgrade')
      return this._failHandshake("'Connection' header value is not 'Upgrade'");

if (accept !== this._accept)
      return this._failHandshake('Sec-WebSocket-Accept mismatch');

this.protocol = null;

if (protocol !== '') {
      if (this._protocols.indexOf(protocol) < 0)
        return this._failHandshake('Sec-WebSocket-Protocol mismatch');
      else
        this.protocol = protocol;
    }

try {
      this._extensions.activate(this.headers['sec-websocket-extensions']);
    } catch (e) {
      return this._failHandshake(e.message);
    }
  }
};

for (var key$5 in instance$5)
  Client$2.prototype[key$5] = instance$5[key$5];

var client$1 = Client$2;

var Buffer$2 = safeBuffer.exports.Buffer,
    Base$3   = base,
    util$7   = require$$2__default["default"];

var Draft75$2 = function(request, url, options) {
  Base$3.apply(this, arguments);
  this._stage  = 0;
  this.version = 'hixie-75';

this._headers.set('Upgrade', 'WebSocket');
  this._headers.set('Connection', 'Upgrade');
  this._headers.set('WebSocket-Origin', this._request.headers.origin);
  this._headers.set('WebSocket-Location', this.url);
};
util$7.inherits(Draft75$2, Base$3);

var instance$4 = {
  close: function() {
    if (this.readyState === 3) return false;
    this.readyState = 3;
    this.emit('close', new Base$3.CloseEvent(null, null));
    return true;
  },

parse: function(chunk) {
    if (this.readyState > 1) return;

this._reader.put(chunk);

this._reader.eachByte(function(octet) {
      var message;

switch (this._stage) {
        case -1:
          this._body.push(octet);
          this._sendHandshakeBody();
          break;

case 0:
          this._parseLeadingByte(octet);
          break;

case 1:
          this._length = (octet & 0x7F) + 128 * this._length;

if (this._closing && this._length === 0) {
            return this.close();
          }
          else if ((octet & 0x80) !== 0x80) {
            if (this._length === 0) {
              this._stage = 0;
            }
            else {
              this._skipped = 0;
              this._stage   = 2;
            }
          }
          break;

case 2:
          if (octet === 0xFF) {
            this._stage = 0;
            message = Buffer$2.from(this._buffer).toString('utf8', 0, this._buffer.length);
            this.emit('message', new Base$3.MessageEvent(message));
          }
          else {
            if (this._length) {
              this._skipped += 1;
              if (this._skipped === this._length)
                this._stage = 0;
            } else {
              this._buffer.push(octet);
              if (this._buffer.length > this._maxLength) return this.close();
            }
          }
          break;
      }
    }, this);
  },

frame: function(buffer) {
    if (this.readyState === 0) return this._queue([buffer]);
    if (this.readyState > 1) return false;

if (typeof buffer !== 'string') buffer = buffer.toString();

var length = Buffer$2.byteLength(buffer),
        frame  = Buffer$2.allocUnsafe(length + 2);

frame[0] = 0x00;
    frame.write(buffer, 1);
    frame[frame.length - 1] = 0xFF;

this._write(frame);
    return true;
  },

_handshakeResponse: function() {
    var start   = 'HTTP/1.1 101 Web Socket Protocol Handshake',
        headers = [start, this._headers.toString(), ''];

return Buffer$2.from(headers.join('\r\n'), 'utf8');
  },

_parseLeadingByte: function(octet) {
    if ((octet & 0x80) === 0x80) {
      this._length = 0;
      this._stage  = 1;
    } else {
      delete this._length;
      delete this._skipped;
      this._buffer = [];
      this._stage  = 2;
    }
  }
};

for (var key$4 in instance$4)
  Draft75$2.prototype[key$4] = instance$4[key$4];

var draft75 = Draft75$2;

var Buffer$1  = safeBuffer.exports.Buffer,
    Base$2    = base,
    Draft75$1 = draft75,
    crypto  = require$$1__default$1["default"],
    util$6    = require$$2__default["default"];

var numberFromKey = function(key) {
  return parseInt((key.match(/[0-9]/g) || []).join(''), 10);
};

var spacesInKey = function(key) {
  return (key.match(/ /g) || []).length;
};

var Draft76$1 = function(request, url, options) {
  Draft75$1.apply(this, arguments);
  this._stage  = -1;
  this._body   = [];
  this.version = 'hixie-76';

this._headers.clear();

this._headers.set('Upgrade', 'WebSocket');
  this._headers.set('Connection', 'Upgrade');
  this._headers.set('Sec-WebSocket-Origin', this._request.headers.origin);
  this._headers.set('Sec-WebSocket-Location', this.url);
};
util$6.inherits(Draft76$1, Draft75$1);

var instance$3 = {
  BODY_SIZE: 8,

start: function() {
    if (!Draft75$1.prototype.start.call(this)) return false;
    this._started = true;
    this._sendHandshakeBody();
    return true;
  },

close: function() {
    if (this.readyState === 3) return false;
    if (this.readyState === 1) this._write(Buffer$1.from([0xFF, 0x00]));
    this.readyState = 3;
    this.emit('close', new Base$2.CloseEvent(null, null));
    return true;
  },

_handshakeResponse: function() {
    var headers = this._request.headers,
        key1    = headers['sec-websocket-key1'],
        key2    = headers['sec-websocket-key2'];

if (!key1) throw new Error('Missing required header: Sec-WebSocket-Key1');
    if (!key2) throw new Error('Missing required header: Sec-WebSocket-Key2');

var number1 = numberFromKey(key1),
        spaces1 = spacesInKey(key1),

number2 = numberFromKey(key2),
        spaces2 = spacesInKey(key2);

if (number1 % spaces1 !== 0 || number2 % spaces2 !== 0)
      throw new Error('Client sent invalid Sec-WebSocket-Key headers');

this._keyValues = [number1 / spaces1, number2 / spaces2];

var start   = 'HTTP/1.1 101 WebSocket Protocol Handshake',
        headers = [start, this._headers.toString(), ''];

return Buffer$1.from(headers.join('\r\n'), 'binary');
  },

_handshakeSignature: function() {
    if (this._body.length < this.BODY_SIZE) return null;

var md5    = crypto.createHash('md5'),
        buffer = Buffer$1.allocUnsafe(8 + this.BODY_SIZE);

buffer.writeUInt32BE(this._keyValues[0], 0);
    buffer.writeUInt32BE(this._keyValues[1], 4);
    Buffer$1.from(this._body).copy(buffer, 8, 0, this.BODY_SIZE);

md5.update(buffer);
    return Buffer$1.from(md5.digest('binary'), 'binary');
  },

_sendHandshakeBody: function() {
    if (!this._started) return;
    var signature = this._handshakeSignature();
    if (!signature) return;

this._write(signature);
    this._stage = 0;
    this._open();

if (this._body.length > this.BODY_SIZE)
      this.parse(this._body.slice(this.BODY_SIZE));
  },

_parseLeadingByte: function(octet) {
    if (octet !== 0xFF)
      return Draft75$1.prototype._parseLeadingByte.call(this, octet);

this._closing = true;
    this._length  = 0;
    this._stage   = 1;
  }
};

for (var key$3 in instance$3)
  Draft76$1.prototype[key$3] = instance$3[key$3];

var draft76 = Draft76$1;

var util$5       = require$$2__default["default"],
    HttpParser = http_parser,
    Base$1       = base,
    Draft75    = draft75,
    Draft76    = draft76,
    Hybi       = hybi;

var Server$1 = function(options) {
  Base$1.call(this, null, null, options);
  this._http = new HttpParser('request');
};
util$5.inherits(Server$1, Base$1);

var instance$2 = {
  EVENTS: ['open', 'message', 'error', 'close', 'ping', 'pong'],

_bindEventListeners: function() {
    this.messages.on('error', function() {});
    this.on('error', function() {});
  },

parse: function(chunk) {
    if (this._delegate) return this._delegate.parse(chunk);

this._http.parse(chunk);
    if (!this._http.isComplete()) return;

this.method  = this._http.method;
    this.url     = this._http.url;
    this.headers = this._http.headers;
    this.body    = this._http.body;

var self = this;
    this._delegate = Server$1.http(this, this._options);
    this._delegate.messages = this.messages;
    this._delegate.io = this.io;
    this._open();

this.EVENTS.forEach(function(event) {
      this._delegate.on(event, function(e) { self.emit(event, e); });
    }, this);

this.protocol = this._delegate.protocol;
    this.version  = this._delegate.version;

this.parse(this._http.body);
    this.emit('connect', new Base$1.ConnectEvent());
  },

_open: function() {
    this.__queue.forEach(function(msg) {
      this._delegate[msg[0]].apply(this._delegate, msg[1]);
    }, this);
    this.__queue = [];
  }
};

['addExtension', 'setHeader', 'start', 'frame', 'text', 'binary', 'ping', 'close'].forEach(function(method) {
  instance$2[method] = function() {
    if (this._delegate) {
      return this._delegate[method].apply(this._delegate, arguments);
    } else {
      this.__queue.push([method, arguments]);
      return true;
    }
  };
});

for (var key$2 in instance$2)
  Server$1.prototype[key$2] = instance$2[key$2];

Server$1.isSecureRequest = function(request) {
  if (request.connection && request.connection.authorized !== undefined) return true;
  if (request.socket && request.socket.secure) return true;

var headers = request.headers;
  if (!headers) return false;
  if (headers['https'] === 'on') return true;
  if (headers['x-forwarded-ssl'] === 'on') return true;
  if (headers['x-forwarded-scheme'] === 'https') return true;
  if (headers['x-forwarded-proto'] === 'https') return true;

return false;
};

Server$1.determineUrl = function(request) {
  var scheme = this.isSecureRequest(request) ? 'wss:' : 'ws:';
  return scheme + '//' + request.headers.host + request.url;
};

Server$1.http = function(request, options) {
  options = options || {};
  if (options.requireMasking === undefined) options.requireMasking = true;

var headers = request.headers,
      version = headers['sec-websocket-version'],
      key     = headers['sec-websocket-key'],
      key1    = headers['sec-websocket-key1'],
      key2    = headers['sec-websocket-key2'],
      url     = this.determineUrl(request);

if (version || key)
    return new Hybi(request, url, options);
  else if (key1 || key2)
    return new Draft76(request, url, options);
  else
    return new Draft75(request, url, options);
};

var server = Server$1;

// Protocol references:
//
// * http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-75
// * http://tools.ietf.org/html/draft-hixie-thewebsocketprotocol-76
// * http://tools.ietf.org/html/draft-ietf-hybi-thewebsocketprotocol-17

var Base   = base,
    Client$1 = client$1,
    Server = server;

var Driver = {
  client: function(url, options) {
    options = options || {};
    if (options.masking === undefined) options.masking = true;
    return new Client$1(url, options);
  },

server: function(options) {
    options = options || {};
    if (options.requireMasking === undefined) options.requireMasking = true;
    return new Server(options);
  },

http: function() {
    return Server.http.apply(Server, arguments);
  },

isSecureRequest: function(request) {
    return Server.isSecureRequest(request);
  },

isWebSocket: function(request) {
    return Base.isWebSocket(request);
  },

validateOptions: function(options, validKeys) {
    Base.validateOptions(options, validKeys);
  }
};

var driver$4 = Driver;

var Event$3 = function(eventType, options) {
  this.type = eventType;
  for (var key in options)
    this[key] = options[key];
};

Event$3.prototype.initEvent = function(eventType, canBubble, cancelable) {
  this.type       = eventType;
  this.bubbles    = canBubble;
  this.cancelable = cancelable;
};

Event$3.prototype.stopPropagation = function() {};
Event$3.prototype.preventDefault  = function() {};

Event$3.CAPTURING_PHASE = 1;
Event$3.AT_TARGET       = 2;
Event$3.BUBBLING_PHASE  = 3;

var event = Event$3;

var Event$2 = event;

var EventTarget$2 = {
  onopen:     null,
  onmessage:  null,
  onerror:    null,
  onclose:    null,

addEventListener: function(eventType, listener, useCapture) {
    this.on(eventType, listener);
  },

removeEventListener: function(eventType, listener, useCapture) {
    this.removeListener(eventType, listener);
  },

dispatchEvent: function(event) {
    event.target = event.currentTarget = this;
    event.eventPhase = Event$2.AT_TARGET;

if (this['on' + event.type])
      this['on' + event.type](event);

this.emit(event.type, event);
  }
};

var event_target = EventTarget$2;

var Stream$1      = require$$0__default$1["default"].Stream,
    util$4        = require$$2__default["default"],
    driver$3      = driver$4,
    EventTarget$1 = event_target,
    Event$1       = event;

var API$3 = function(options) {
  options = options || {};
  driver$3.validateOptions(options, ['headers', 'extensions', 'maxLength', 'ping', 'proxy', 'tls', 'ca']);

this.readable = this.writable = true;

var headers = options.headers;
  if (headers) {
    for (var name in headers) this._driver.setHeader(name, headers[name]);
  }

var extensions = options.extensions;
  if (extensions) {
    [].concat(extensions).forEach(this._driver.addExtension, this._driver);
  }

this._ping          = options.ping;
  this._pingId        = 0;
  this.readyState     = API$3.CONNECTING;
  this.bufferedAmount = 0;
  this.protocol       = '';
  this.url            = this._driver.url;
  this.version        = this._driver.version;

var self = this;

this._driver.on('open',    function(e) { self._open(); });
  this._driver.on('message', function(e) { self._receiveMessage(e.data); });
  this._driver.on('close',   function(e) { self._beginClose(e.reason, e.code); });

this._driver.on('error', function(error) {
    self._emitError(error.message);
  });
  this.on('error', function() {});

this._driver.messages.on('drain', function() {
    self.emit('drain');
  });

if (this._ping)
    this._pingTimer = setInterval(function() {
      self._pingId += 1;
      self.ping(self._pingId.toString());
    }, this._ping * 1000);

this._configureStream();

if (!this._proxy) {
    this._stream.pipe(this._driver.io);
    this._driver.io.pipe(this._stream);
  }
};
util$4.inherits(API$3, Stream$1);

API$3.CONNECTING = 0;
API$3.OPEN       = 1;
API$3.CLOSING    = 2;
API$3.CLOSED     = 3;

API$3.CLOSE_TIMEOUT = 30000;

var instance$1 = {
  write: function(data) {
    return this.send(data);
  },

end: function(data) {
    if (data !== undefined) this.send(data);
    this.close();
  },

pause: function() {
    return this._driver.messages.pause();
  },

resume: function() {
    return this._driver.messages.resume();
  },

send: function(data) {
    if (this.readyState > API$3.OPEN) return false;
    if (!(data instanceof Buffer)) data = String(data);
    return this._driver.messages.write(data);
  },

ping: function(message, callback) {
    if (this.readyState > API$3.OPEN) return false;
    return this._driver.ping(message, callback);
  },

close: function(code, reason) {
    if (code === undefined) code = 1000;
    if (reason === undefined) reason = '';

if (code !== 1000 && (code < 3000 || code > 4999))
      throw new Error("Failed to execute 'close' on WebSocket: " +
                      "The code must be either 1000, or between 3000 and 4999. " +
                      code + " is neither.");

if (this.readyState < API$3.CLOSING) {
      var self = this;
      this._closeTimer = setTimeout(function() {
        self._beginClose('', 1006);
      }, API$3.CLOSE_TIMEOUT);
    }

if (this.readyState !== API$3.CLOSED) this.readyState = API$3.CLOSING;

this._driver.close(reason, code);
  },

_configureStream: function() {
    var self = this;

this._stream.setTimeout(0);
    this._stream.setNoDelay(true);

['close', 'end'].forEach(function(event) {
      this._stream.on(event, function() { self._finalizeClose(); });
    }, this);

this._stream.on('error', function(error) {
      self._emitError('Network error: ' + self.url + ': ' + error.message);
      self._finalizeClose();
    });
  },

_open: function() {
    if (this.readyState !== API$3.CONNECTING) return;

this.readyState = API$3.OPEN;
    this.protocol = this._driver.protocol || '';

var event = new Event$1('open');
    event.initEvent('open', false, false);
    this.dispatchEvent(event);
  },

_receiveMessage: function(data) {
    if (this.readyState > API$3.OPEN) return false;

if (this.readable) this.emit('data', data);

var event = new Event$1('message', { data: data });
    event.initEvent('message', false, false);
    this.dispatchEvent(event);
  },

_emitError: function(message) {
    if (this.readyState >= API$3.CLOSING) return;

var event = new Event$1('error', { message: message });
    event.initEvent('error', false, false);
    this.dispatchEvent(event);
  },

_beginClose: function(reason, code) {
    if (this.readyState === API$3.CLOSED) return;
    this.readyState = API$3.CLOSING;
    this._closeParams = [reason, code];

if (this._stream) {
      this._stream.destroy();
      if (!this._stream.readable) this._finalizeClose();
    }
  },

_finalizeClose: function() {
    if (this.readyState === API$3.CLOSED) return;
    this.readyState = API$3.CLOSED;

if (this._closeTimer) clearTimeout(this._closeTimer);
    if (this._pingTimer) clearInterval(this._pingTimer);
    if (this._stream) this._stream.end();

if (this.readable) this.emit('end');
    this.readable = this.writable = false;

var reason = this._closeParams ? this._closeParams[0] : '',
        code   = this._closeParams ? this._closeParams[1] : 1006;

var event = new Event$1('close', { code: code, reason: reason });
    event.initEvent('close', false, false);
    this.dispatchEvent(event);
  }
};

for (var method$1 in instance$1) API$3.prototype[method$1] = instance$1[method$1];
for (var key$1 in EventTarget$1) API$3.prototype[key$1] = EventTarget$1[key$1];

var api = API$3;

var util$3   = require$$2__default["default"],
    net    = require$$1__default$2["default"],
    tls    = require$$2__default$2["default"],
    url    = require$$2__default$1["default"],
    driver$2 = driver$4,
    API$2    = api;

var DEFAULT_PORTS    = { 'http:': 80, 'https:': 443, 'ws:':80, 'wss:': 443 },
    SECURE_PROTOCOLS = ['https:', 'wss:'];

var Client = function(_url, protocols, options) {
  options = options || {};

this.url     = _url;
  this._driver = driver$2.client(this.url, { maxLength: options.maxLength, protocols: protocols });

['open', 'error'].forEach(function(event) {
    this._driver.on(event, function() {
      self.headers    = self._driver.headers;
      self.statusCode = self._driver.statusCode;
    });
  }, this);

var proxy      = options.proxy || {},
      endpoint   = url.parse(proxy.origin || this.url),
      port       = endpoint.port || DEFAULT_PORTS[endpoint.protocol],
      secure     = SECURE_PROTOCOLS.indexOf(endpoint.protocol) >= 0,
      onConnect  = function() { self._onConnect(); },
      netOptions = options.net || {},
      originTLS  = options.tls || {},
      socketTLS  = proxy.origin ? (proxy.tls || {}) : originTLS,
      self       = this;

netOptions.host = socketTLS.host = endpoint.hostname;
  netOptions.port = socketTLS.port = port;

originTLS.ca = originTLS.ca || options.ca;
  socketTLS.servername = socketTLS.servername || endpoint.hostname;

this._stream = secure
               ? tls.connect(socketTLS, onConnect)
               : net.connect(netOptions, onConnect);

if (proxy.origin) this._configureProxy(proxy, originTLS);

API$2.call(this, options);
};
util$3.inherits(Client, API$2);

Client.prototype._onConnect = function() {
  var worker = this._proxy || this._driver;
  worker.start();
};

Client.prototype._configureProxy = function(proxy, originTLS) {
  var uri    = url.parse(this.url),
      secure = SECURE_PROTOCOLS.indexOf(uri.protocol) >= 0,
      self   = this,
      name;

this._proxy = this._driver.proxy(proxy.origin);

if (proxy.headers) {
    for (name in proxy.headers) this._proxy.setHeader(name, proxy.headers[name]);
  }

this._proxy.pipe(this._stream, { end: false });
  this._stream.pipe(this._proxy);

this._proxy.on('connect', function() {
    if (secure) {
      var options = { socket: self._stream, servername: uri.hostname };
      for (name in originTLS) options[name] = originTLS[name];
      self._stream = tls.connect(options);
      self._configureStream();
    }
    self._driver.io.pipe(self._stream);
    self._stream.pipe(self._driver.io);
    self._driver.start();
  });

this._proxy.on('error', function(error) {
    self._driver.emit('error', error);
  });
};

var client = Client;

var Stream      = require$$0__default$1["default"].Stream,
    util$2        = require$$2__default["default"],
    driver$1      = driver$4,
    Headers     = headers,
    API$1         = api,
    EventTarget = event_target,
    Event       = event;

var EventSource = function(request, response, options) {
  this.writable = true;
  options = options || {};

this._stream = response.socket;
  this._ping   = options.ping  || this.DEFAULT_PING;
  this._retry  = options.retry || this.DEFAULT_RETRY;

var scheme       = driver$1.isSecureRequest(request) ? 'https:' : 'http:';
  this.url         = scheme + '//' + request.headers.host + request.url;
  this.lastEventId = request.headers['last-event-id'] || '';
  this.readyState  = API$1.CONNECTING;

var headers = new Headers(),
      self    = this;

if (options.headers) {
    for (var key in options.headers) headers.set(key, options.headers[key]);
  }

if (!this._stream || !this._stream.writable) return;
  process.nextTick(function() { self._open(); });

this._stream.setTimeout(0);
  this._stream.setNoDelay(true);

var handshake = 'HTTP/1.1 200 OK\r\n' +
                  'Content-Type: text/event-stream\r\n' +
                  'Cache-Control: no-cache, no-store\r\n' +
                  'Connection: close\r\n' +
                  headers.toString() +
                  '\r\n' +
                  'retry: ' + Math.floor(this._retry * 1000) + '\r\n\r\n';

this._write(handshake);

this._stream.on('drain', function() { self.emit('drain'); });

if (this._ping)
    this._pingTimer = setInterval(function() { self.ping(); }, this._ping * 1000);

['error', 'end'].forEach(function(event) {
    self._stream.on(event, function() { self.close(); });
  });
};
util$2.inherits(EventSource, Stream);

EventSource.isEventSource = function(request) {
  if (request.method !== 'GET') return false;
  var accept = (request.headers.accept || '').split(/\s*,\s*/);
  return accept.indexOf('text/event-stream') >= 0;
};

var instance = {
  DEFAULT_PING:   10,
  DEFAULT_RETRY:  5,

_write: function(chunk) {
    if (!this.writable) return false;
    try {
      return this._stream.write(chunk, 'utf8');
    } catch (e) {
      return false;
    }
  },

_open: function() {
    if (this.readyState !== API$1.CONNECTING) return;

this.readyState = API$1.OPEN;

var event = new Event('open');
    event.initEvent('open', false, false);
    this.dispatchEvent(event);
  },

write: function(message) {
    return this.send(message);
  },

end: function(message) {
    if (message !== undefined) this.write(message);
    this.close();
  },

send: function(message, options) {
    if (this.readyState > API$1.OPEN) return false;

message = String(message).replace(/(\r\n|\r|\n)/g, '$1data: ');
    options = options || {};

var frame = '';
    if (options.event) frame += 'event: ' + options.event + '\r\n';
    if (options.id)    frame += 'id: '    + options.id    + '\r\n';
    frame += 'data: ' + message + '\r\n\r\n';

return this._write(frame);
  },

ping: function() {
    return this._write(':\r\n\r\n');
  },

close: function() {
    if (this.readyState > API$1.OPEN) return false;

this.readyState = API$1.CLOSED;
    this.writable = false;
    if (this._pingTimer) clearInterval(this._pingTimer);
    if (this._stream) this._stream.end();

var event = new Event('close');
    event.initEvent('close', false, false);
    this.dispatchEvent(event);

return true;
  }
};

for (var method in instance) EventSource.prototype[method] = instance[method];
for (var key in EventTarget) EventSource.prototype[key] = EventTarget[key];

var eventsource = EventSource;

var util$1   = require$$2__default["default"],
    driver = driver$4,
    API    = api;

var WebSocket$1 = function(request, socket, body, protocols, options) {
  options = options || {};

this._stream = socket;
  this._driver = driver.http(request, { maxLength: options.maxLength, protocols: protocols });

var self = this;
  if (!this._stream || !this._stream.writable) return;
  if (!this._stream.readable) return this._stream.end();

var catchup = function() { self._stream.removeListener('data', catchup); };
  this._stream.on('data', catchup);

API.call(this, options);

process.nextTick(function() {
    self._driver.start();
    self._driver.io.write(body);
  });
};
util$1.inherits(WebSocket$1, API);

WebSocket$1.isWebSocket = function(request) {
  return driver.isWebSocket(request);
};

WebSocket$1.validateOptions = function(options, validKeys) {
  driver.validateOptions(options, validKeys);
};

WebSocket$1.WebSocket   = WebSocket$1;
WebSocket$1.Client      = client;
WebSocket$1.EventSource = eventsource;

var websocket        = WebSocket$1;

Object.defineProperty(index_standalone, '__esModule', { value: true });

var Websocket = websocket;
var util = require$$1__default$3["default"];
var tslib = require$$2__default$3["default"];
var logger$1 = require$$3__default["default"];

function _interopDefaultLegacy$1 (e) { return e && typeof e === 'object' && 'default' in e ? e : { 'default': e }; }

var Websocket__default = /*#__PURE__*/_interopDefaultLegacy$1(Websocket);

/**
 * @license
 * Copyright 2019 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/** The semver (www.semver.org) version of the SDK. */
var SDK_VERSION = '';
/**
 * SDK_VERSION should be set before any database instance is created
 * @internal
 */
function setSDKVersion(version) {
    SDK_VERSION = version;
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
// URL query parameters associated with longpolling
var FIREBASE_LONGPOLL_START_PARAM = 'start';
var FIREBASE_LONGPOLL_CLOSE_COMMAND = 'close';
var FIREBASE_LONGPOLL_COMMAND_CB_NAME = 'pLPCommand';
var FIREBASE_LONGPOLL_DATA_CB_NAME = 'pRTLPCB';
var FIREBASE_LONGPOLL_ID_PARAM = 'id';
var FIREBASE_LONGPOLL_PW_PARAM = 'pw';
var FIREBASE_LONGPOLL_SERIAL_PARAM = 'ser';
var FIREBASE_LONGPOLL_CALLBACK_ID_PARAM = 'cb';
var FIREBASE_LONGPOLL_SEGMENT_NUM_PARAM = 'seg';
var FIREBASE_LONGPOLL_SEGMENTS_IN_PACKET = 'ts';
var FIREBASE_LONGPOLL_DATA_PARAM = 'd';
var FIREBASE_LONGPOLL_DISCONN_FRAME_REQUEST_PARAM = 'dframe';
//Data size constants.
//TODO: Perf: the maximum length actually differs from browser to browser.
// We should check what browser we're on and set accordingly.
var MAX_URL_DATA_SIZE = 1870;
var SEG_HEADER_SIZE = 30; //ie: &seg=8299234&ts=982389123&d=
var MAX_PAYLOAD_SIZE = MAX_URL_DATA_SIZE - SEG_HEADER_SIZE;
/**
 * Keepalive period
 * send a fresh request at minimum every 25 seconds. Opera has a maximum request
 * length of 30 seconds that we can't exceed.
 */
var KEEPALIVE_REQUEST_INTERVAL = 25000;
/**
 * How long to wait before aborting a long-polling connection attempt.
 */
var LP_CONNECT_TIMEOUT = 30000;
/**
 * This class manages a single long-polling connection.
 */
var BrowserPollConnection = /** @class */ (function () {
    /**
     * @param connId An identifier for this connection, used for logging
     * @param repoInfo The info for the endpoint to send data to.
     * @param applicationId The Firebase App ID for this project.
     * @param appCheckToken The AppCheck token for this client.
     * @param authToken The AuthToken to use for this connection.
     * @param transportSessionId Optional transportSessionid if we are
     * reconnecting for an existing transport session
     * @param lastSessionId Optional lastSessionId if the PersistentConnection has
     * already created a connection previously
     */
    function BrowserPollConnection(connId, repoInfo, applicationId, appCheckToken, authToken, transportSessionId, lastSessionId) {
        var _this = this;
        this.connId = connId;
        this.repoInfo = repoInfo;
        this.applicationId = applicationId;
        this.appCheckToken = appCheckToken;
        this.authToken = authToken;
        this.transportSessionId = transportSessionId;
        this.lastSessionId = lastSessionId;
        this.bytesSent = 0;
        this.bytesReceived = 0;
        this.everConnected_ = false;
        this.log_ = logWrapper(connId);
        this.stats_ = statsManagerGetCollection(repoInfo);
        this.urlFn = function (params) {
            // Always add the token if we have one.
            if (_this.appCheckToken) {
                params[APP_CHECK_TOKEN_PARAM] = _this.appCheckToken;
            }
            return repoInfoConnectionURL(repoInfo, LONG_POLLING, params);
        };
    }
    /**
     * @param onMessage - Callback when messages arrive
     * @param onDisconnect - Callback with connection lost.
     */
    BrowserPollConnection.prototype.open = function (onMessage, onDisconnect) {
        var _this = this;
        this.curSegmentNum = 0;
        this.onDisconnect_ = onDisconnect;
        this.myPacketOrderer = new PacketReceiver(onMessage);
        this.isClosed_ = false;
        this.connectTimeoutTimer_ = setTimeout(function () {
            _this.log_('Timed out trying to connect.');
            // Make sure we clear the host cache
            _this.onClosed_();
            _this.connectTimeoutTimer_ = null;
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
        }, Math.floor(LP_CONNECT_TIMEOUT));
        // Ensure we delay the creation of the iframe until the DOM is loaded.
        executeWhenDOMReady(function () {
            if (_this.isClosed_) {
                return;
            }
            //Set up a callback that gets triggered once a connection is set up.
            _this.scriptTagHolder = new FirebaseIFrameScriptHolder(function () {
                var args = [];
                for (var _i = 0; _i < arguments.length; _i++) {
                    args[_i] = arguments[_i];
                }
                var _a = tslib.__read(args, 5), command = _a[0], arg1 = _a[1], arg2 = _a[2]; _a[3]; _a[4];
                _this.incrementIncomingBytes_(args);
                if (!_this.scriptTagHolder) {
                    return; // we closed the connection.
                }
                if (_this.connectTimeoutTimer_) {
                    clearTimeout(_this.connectTimeoutTimer_);
                    _this.connectTimeoutTimer_ = null;
                }
                _this.everConnected_ = true;
                if (command === FIREBASE_LONGPOLL_START_PARAM) {
                    _this.id = arg1;
                    _this.password = arg2;
                }
                else if (command === FIREBASE_LONGPOLL_CLOSE_COMMAND) {
                    // Don't clear the host cache. We got a response from the server, so we know it's reachable
                    if (arg1) {
                        // We aren't expecting any more data (other than what the server's already in the process of sending us
                        // through our already open polls), so don't send any more.
                        _this.scriptTagHolder.sendNewPolls = false;
                        // arg1 in this case is the last response number sent by the server. We should try to receive
                        // all of the responses up to this one before closing
                        _this.myPacketOrderer.closeAfter(arg1, function () {
                            _this.onClosed_();
                        });
                    }
                    else {
                        _this.onClosed_();
                    }
                }
                else {
                    throw new Error('Unrecognized command received: ' + command);
                }
            }, function () {
                var args = [];
                for (var _i = 0; _i < arguments.length; _i++) {
                    args[_i] = arguments[_i];
                }
                var _a = tslib.__read(args, 2), pN = _a[0], data = _a[1];
                _this.incrementIncomingBytes_(args);
                _this.myPacketOrderer.handleResponse(pN, data);
            }, function () {
                _this.onClosed_();
            }, _this.urlFn);
            //Send the initial request to connect. The serial number is simply to keep the browser from pulling previous results
            //from cache.
            var urlParams = {};
            urlParams[FIREBASE_LONGPOLL_START_PARAM] = 't';
            urlParams[FIREBASE_LONGPOLL_SERIAL_PARAM] = Math.floor(Math.random() * 100000000);
            if (_this.scriptTagHolder.uniqueCallbackIdentifier) {
                urlParams[FIREBASE_LONGPOLL_CALLBACK_ID_PARAM] =
                    _this.scriptTagHolder.uniqueCallbackIdentifier;
            }
            urlParams[VERSION_PARAM] = PROTOCOL_VERSION;
            if (_this.transportSessionId) {
                urlParams[TRANSPORT_SESSION_PARAM] = _this.transportSessionId;
            }
            if (_this.lastSessionId) {
                urlParams[LAST_SESSION_PARAM] = _this.lastSessionId;
            }
            if (_this.applicationId) {
                urlParams[APPLICATION_ID_PARAM] = _this.applicationId;
            }
            if (_this.appCheckToken) {
                urlParams[APP_CHECK_TOKEN_PARAM] = _this.appCheckToken;
            }
            if (typeof location !== 'undefined' &&
                location.hostname &&
                FORGE_DOMAIN_RE.test(location.hostname)) {
                urlParams[REFERER_PARAM] = FORGE_REF;
            }
            var connectURL = _this.urlFn(urlParams);
            _this.log_('Connecting via long-poll to ' + connectURL);
            _this.scriptTagHolder.addTag(connectURL, function () {
                /* do nothing */
            });
        });
    };
    /**
     * Call this when a handshake has completed successfully and we want to consider the connection established
     */
    BrowserPollConnection.prototype.start = function () {
        this.scriptTagHolder.startLongPoll(this.id, this.password);
        this.addDisconnectPingFrame(this.id, this.password);
    };
    /**
     * Forces long polling to be considered as a potential transport
     */
    BrowserPollConnection.forceAllow = function () {
        BrowserPollConnection.forceAllow_ = true;
    };
    /**
     * Forces longpolling to not be considered as a potential transport
     */
    BrowserPollConnection.forceDisallow = function () {
        BrowserPollConnection.forceDisallow_ = true;
    };
    // Static method, use string literal so it can be accessed in a generic way
    BrowserPollConnection.isAvailable = function () {
        if (util.isNodeSdk()) {
            return false;
        }
        else if (BrowserPollConnection.forceAllow_) {
            return true;
        }
        else {
            // NOTE: In React-Native there's normally no 'document', but if you debug a React-Native app in
            // the Chrome debugger, 'document' is defined, but document.createElement is null (2015/06/08).
            return (!BrowserPollConnection.forceDisallow_ &&
                typeof document !== 'undefined' &&
                document.createElement != null &&
                !isChromeExtensionContentScript() &&
                !isWindowsStoreApp());
        }
    };
    /**
     * No-op for polling
     */
    BrowserPollConnection.prototype.markConnectionHealthy = function () { };
    /**
     * Stops polling and cleans up the iframe
     */
    BrowserPollConnection.prototype.shutdown_ = function () {
        this.isClosed_ = true;
        if (this.scriptTagHolder) {
            this.scriptTagHolder.close();
            this.scriptTagHolder = null;
        }
        //remove the disconnect frame, which will trigger an XHR call to the server to tell it we're leaving.
        if (this.myDisconnFrame) {
            document.body.removeChild(this.myDisconnFrame);
            this.myDisconnFrame = null;
        }
        if (this.connectTimeoutTimer_) {
            clearTimeout(this.connectTimeoutTimer_);
            this.connectTimeoutTimer_ = null;
        }
    };
    /**
     * Triggered when this transport is closed
     */
    BrowserPollConnection.prototype.onClosed_ = function () {
        if (!this.isClosed_) {
            this.log_('Longpoll is closing itself');
            this.shutdown_();
            if (this.onDisconnect_) {
                this.onDisconnect_(this.everConnected_);
                this.onDisconnect_ = null;
            }
        }
    };
    /**
     * External-facing close handler. RealTime has requested we shut down. Kill our connection and tell the server
     * that we've left.
     */
    BrowserPollConnection.prototype.close = function () {
        if (!this.isClosed_) {
            this.log_('Longpoll is being closed.');
            this.shutdown_();
        }
    };
    /**
     * Send the JSON object down to the server. It will need to be stringified, base64 encoded, and then
     * broken into chunks (since URLs have a small maximum length).
     * @param data - The JSON data to transmit.
     */
    BrowserPollConnection.prototype.send = function (data) {
        var dataStr = util.stringify(data);
        this.bytesSent += dataStr.length;
        this.stats_.incrementCounter('bytes_sent', dataStr.length);
        //first, lets get the base64-encoded data
        var base64data = util.base64Encode(dataStr);
        //We can only fit a certain amount in each URL, so we need to split this request
        //up into multiple pieces if it doesn't fit in one request.
        var dataSegs = splitStringBySize(base64data, MAX_PAYLOAD_SIZE);
        //Enqueue each segment for transmission. We assign each chunk a sequential ID and a total number
        //of segments so that we can reassemble the packet on the server.
        for (var i = 0; i < dataSegs.length; i++) {
            this.scriptTagHolder.enqueueSegment(this.curSegmentNum, dataSegs.length, dataSegs[i]);
            this.curSegmentNum++;
        }
    };
    /**
     * This is how we notify the server that we're leaving.
     * We aren't able to send requests with DHTML on a window close event, but we can
     * trigger XHR requests in some browsers (everything but Opera basically).
     */
    BrowserPollConnection.prototype.addDisconnectPingFrame = function (id, pw) {
        if (util.isNodeSdk()) {
            return;
        }
        this.myDisconnFrame = document.createElement('iframe');
        var urlParams = {};
        urlParams[FIREBASE_LONGPOLL_DISCONN_FRAME_REQUEST_PARAM] = 't';
        urlParams[FIREBASE_LONGPOLL_ID_PARAM] = id;
        urlParams[FIREBASE_LONGPOLL_PW_PARAM] = pw;
        this.myDisconnFrame.src = this.urlFn(urlParams);
        this.myDisconnFrame.style.display = 'none';
        document.body.appendChild(this.myDisconnFrame);
    };
    /**
     * Used to track the bytes received by this client
     */
    BrowserPollConnection.prototype.incrementIncomingBytes_ = function (args) {
        // TODO: This is an annoying perf hit just to track the number of incoming bytes.  Maybe it should be opt-in.
        var bytesReceived = util.stringify(args).length;
        this.bytesReceived += bytesReceived;
        this.stats_.incrementCounter('bytes_received', bytesReceived);
    };
    return BrowserPollConnection;
}());
/*********************************************************************************************
 * A wrapper around an iframe that is used as a long-polling script holder.
 *********************************************************************************************/
var FirebaseIFrameScriptHolder = /** @class */ (function () {
    /**
     * @param commandCB - The callback to be called when control commands are recevied from the server.
     * @param onMessageCB - The callback to be triggered when responses arrive from the server.
     * @param onDisconnect - The callback to be triggered when this tag holder is closed
     * @param urlFn - A function that provides the URL of the endpoint to send data to.
     */
    function FirebaseIFrameScriptHolder(commandCB, onMessageCB, onDisconnect, urlFn) {
        this.onDisconnect = onDisconnect;
        this.urlFn = urlFn;
        //We maintain a count of all of the outstanding requests, because if we have too many active at once it can cause
        //problems in some browsers.
        this.outstandingRequests = new Set();
        //A queue of the pending segments waiting for transmission to the server.
        this.pendingSegs = [];
        //A serial number. We use this for two things:
        // 1) A way to ensure the browser doesn't cache responses to polls
        // 2) A way to make the server aware when long-polls arrive in a different order than we started them. The
        //    server needs to release both polls in this case or it will cause problems in Opera since Opera can only execute
        //    JSONP code in the order it was added to the iframe.
        this.currentSerial = Math.floor(Math.random() * 100000000);
        // This gets set to false when we're "closing down" the connection (e.g. we're switching transports but there's still
        // incoming data from the server that we're waiting for).
        this.sendNewPolls = true;
        if (!util.isNodeSdk()) {
            //Each script holder registers a couple of uniquely named callbacks with the window. These are called from the
            //iframes where we put the long-polling script tags. We have two callbacks:
            //   1) Command Callback - Triggered for control issues, like starting a connection.
            //   2) Message Callback - Triggered when new data arrives.
            this.uniqueCallbackIdentifier = LUIDGenerator();
            window[FIREBASE_LONGPOLL_COMMAND_CB_NAME + this.uniqueCallbackIdentifier] = commandCB;
            window[FIREBASE_LONGPOLL_DATA_CB_NAME + this.uniqueCallbackIdentifier] =
                onMessageCB;
            //Create an iframe for us to add script tags to.
            this.myIFrame = FirebaseIFrameScriptHolder.createIFrame_();
            // Set the iframe's contents.
            var script = '';
            // if we set a javascript url, it's IE and we need to set the document domain. The javascript url is sufficient
            // for ie9, but ie8 needs to do it again in the document itself.
            if (this.myIFrame.src &&
                this.myIFrame.src.substr(0, 'javascript:'.length) === 'javascript:') {
                var currentDomain = document.domain;
                script = '<script>document.domain="' + currentDomain + '";</script>';
            }
            var iframeContents = '<html><body>' + script + '</body></html>';
            try {
                this.myIFrame.doc.open();
                this.myIFrame.doc.write(iframeContents);
                this.myIFrame.doc.close();
            }
            catch (e) {
                log('frame writing exception');
                if (e.stack) {
                    log(e.stack);
                }
                log(e);
            }
        }
        else {
            this.commandCB = commandCB;
            this.onMessageCB = onMessageCB;
        }
    }
    /**
     * Each browser has its own funny way to handle iframes. Here we mush them all together into one object that I can
     * actually use.
     */
    FirebaseIFrameScriptHolder.createIFrame_ = function () {
        var iframe = document.createElement('iframe');
        iframe.style.display = 'none';
        // This is necessary in order to initialize the document inside the iframe
        if (document.body) {
            document.body.appendChild(iframe);
            try {
                // If document.domain has been modified in IE, this will throw an error, and we need to set the
                // domain of the iframe's document manually. We can do this via a javascript: url as the src attribute
                // Also note that we must do this *after* the iframe has been appended to the page. Otherwise it doesn't work.
                var a = iframe.contentWindow.document;
                if (!a) {
                    // Apologies for the log-spam, I need to do something to keep closure from optimizing out the assignment above.
                    log('No IE domain setting required');
                }
            }
            catch (e) {
                var domain = document.domain;
                iframe.src =
                    "javascript:void((function(){document.open();document.domain='" +
                        domain +
                        "';document.close();})())";
            }
        }
        else {
            // LongPollConnection attempts to delay initialization until the document is ready, so hopefully this
            // never gets hit.
            throw 'Document body has not initialized. Wait to initialize Firebase until after the document is ready.';
        }
        // Get the document of the iframe in a browser-specific way.
        if (iframe.contentDocument) {
            iframe.doc = iframe.contentDocument; // Firefox, Opera, Safari
        }
        else if (iframe.contentWindow) {
            iframe.doc = iframe.contentWindow.document; // Internet Explorer
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
        }
        else if (iframe.document) {
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            iframe.doc = iframe.document; //others?
        }
        return iframe;
    };
    /**
     * Cancel all outstanding queries and remove the frame.
     */
    FirebaseIFrameScriptHolder.prototype.close = function () {
        var _this = this;
        //Mark this iframe as dead, so no new requests are sent.
        this.alive = false;
        if (this.myIFrame) {
            //We have to actually remove all of the html inside this iframe before removing it from the
            //window, or IE will continue loading and executing the script tags we've already added, which
            //can lead to some errors being thrown. Setting innerHTML seems to be the easiest way to do this.
            this.myIFrame.doc.body.innerHTML = '';
            setTimeout(function () {
                if (_this.myIFrame !== null) {
                    document.body.removeChild(_this.myIFrame);
                    _this.myIFrame = null;
                }
            }, Math.floor(0));
        }
        // Protect from being called recursively.
        var onDisconnect = this.onDisconnect;
        if (onDisconnect) {
            this.onDisconnect = null;
            onDisconnect();
        }
    };
    /**
     * Actually start the long-polling session by adding the first script tag(s) to the iframe.
     * @param id - The ID of this connection
     * @param pw - The password for this connection
     */
    FirebaseIFrameScriptHolder.prototype.startLongPoll = function (id, pw) {
        this.myID = id;
        this.myPW = pw;
        this.alive = true;
        //send the initial request. If there are requests queued, make sure that we transmit as many as we are currently able to.
        while (this.newRequest_()) { }
    };
    /**
     * This is called any time someone might want a script tag to be added. It adds a script tag when there aren't
     * too many outstanding requests and we are still alive.
     *
     * If there are outstanding packet segments to send, it sends one. If there aren't, it sends a long-poll anyways if
     * needed.
     */
    FirebaseIFrameScriptHolder.prototype.newRequest_ = function () {
        // We keep one outstanding request open all the time to receive data, but if we need to send data
        // (pendingSegs.length > 0) then we create a new request to send the data.  The server will automatically
        // close the old request.
        if (this.alive &&
            this.sendNewPolls &&
            this.outstandingRequests.size < (this.pendingSegs.length > 0 ? 2 : 1)) {
            //construct our url
            this.currentSerial++;
            var urlParams = {};
            urlParams[FIREBASE_LONGPOLL_ID_PARAM] = this.myID;
            urlParams[FIREBASE_LONGPOLL_PW_PARAM] = this.myPW;
            urlParams[FIREBASE_LONGPOLL_SERIAL_PARAM] = this.currentSerial;
            var theURL = this.urlFn(urlParams);
            //Now add as much data as we can.
            var curDataString = '';
            var i = 0;
            while (this.pendingSegs.length > 0) {
                //first, lets see if the next segment will fit.
                var nextSeg = this.pendingSegs[0];
                if (nextSeg.d.length +
                    SEG_HEADER_SIZE +
                    curDataString.length <=
                    MAX_URL_DATA_SIZE) {
                    //great, the segment will fit. Lets append it.
                    var theSeg = this.pendingSegs.shift();
                    curDataString =
                        curDataString +
                            '&' +
                            FIREBASE_LONGPOLL_SEGMENT_NUM_PARAM +
                            i +
                            '=' +
                            theSeg.seg +
                            '&' +
                            FIREBASE_LONGPOLL_SEGMENTS_IN_PACKET +
                            i +
                            '=' +
                            theSeg.ts +
                            '&' +
                            FIREBASE_LONGPOLL_DATA_PARAM +
                            i +
                            '=' +
                            theSeg.d;
                    i++;
                }
                else {
                    break;
                }
            }
            theURL = theURL + curDataString;
            this.addLongPollTag_(theURL, this.currentSerial);
            return true;
        }
        else {
            return false;
        }
    };
    /**
     * Queue a packet for transmission to the server.
     * @param segnum - A sequential id for this packet segment used for reassembly
     * @param totalsegs - The total number of segments in this packet
     * @param data - The data for this segment.
     */
    FirebaseIFrameScriptHolder.prototype.enqueueSegment = function (segnum, totalsegs, data) {
        //add this to the queue of segments to send.
        this.pendingSegs.push({ seg: segnum, ts: totalsegs, d: data });
        //send the data immediately if there isn't already data being transmitted, unless
        //startLongPoll hasn't been called yet.
        if (this.alive) {
            this.newRequest_();
        }
    };
    /**
     * Add a script tag for a regular long-poll request.
     * @param url - The URL of the script tag.
     * @param serial - The serial number of the request.
     */
    FirebaseIFrameScriptHolder.prototype.addLongPollTag_ = function (url, serial) {
        var _this = this;
        //remember that we sent this request.
        this.outstandingRequests.add(serial);
        var doNewRequest = function () {
            _this.outstandingRequests.delete(serial);
            _this.newRequest_();
        };
        // If this request doesn't return on its own accord (by the server sending us some data), we'll
        // create a new one after the KEEPALIVE interval to make sure we always keep a fresh request open.
        var keepaliveTimeout = setTimeout(doNewRequest, Math.floor(KEEPALIVE_REQUEST_INTERVAL));
        var readyStateCB = function () {
            // Request completed.  Cancel the keepalive.
            clearTimeout(keepaliveTimeout);
            // Trigger a new request so we can continue receiving data.
            doNewRequest();
        };
        this.addTag(url, readyStateCB);
    };
    /**
     * Add an arbitrary script tag to the iframe.
     * @param url - The URL for the script tag source.
     * @param loadCB - A callback to be triggered once the script has loaded.
     */
    FirebaseIFrameScriptHolder.prototype.addTag = function (url, loadCB) {
        var _this = this;
        if (util.isNodeSdk()) {
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            this.doNodeLongPoll(url, loadCB);
        }
        else {
            setTimeout(function () {
                try {
                    // if we're already closed, don't add this poll
                    if (!_this.sendNewPolls) {
                        return;
                    }
                    var newScript_1 = _this.myIFrame.doc.createElement('script');
                    newScript_1.type = 'text/javascript';
                    newScript_1.async = true;
                    newScript_1.src = url;
                    // eslint-disable-next-line @typescript-eslint/no-explicit-any
                    newScript_1.onload = newScript_1.onreadystatechange =
                        function () {
                            // eslint-disable-next-line @typescript-eslint/no-explicit-any
                            var rstate = newScript_1.readyState;
                            if (!rstate || rstate === 'loaded' || rstate === 'complete') {
                                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                                newScript_1.onload = newScript_1.onreadystatechange = null;
                                if (newScript_1.parentNode) {
                                    newScript_1.parentNode.removeChild(newScript_1);
                                }
                                loadCB();
                            }
                        };
                    newScript_1.onerror = function () {
                        log('Long-poll script failed to load: ' + url);
                        _this.sendNewPolls = false;
                        _this.close();
                    };
                    _this.myIFrame.doc.body.appendChild(newScript_1);
                }
                catch (e) {
                    // TODO: we should make this error visible somehow
                }
            }, Math.floor(1));
        }
    };
    return FirebaseIFrameScriptHolder;
}());

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var RECONNECT_MIN_DELAY = 1000;
var RECONNECT_MAX_DELAY_DEFAULT = 60 * 5 * 1000; // 5 minutes in milliseconds (Case: 1858)
var RECONNECT_MAX_DELAY_FOR_ADMINS = 30 * 1000; // 30 seconds for admin clients (likely to be a backend server)
var RECONNECT_DELAY_MULTIPLIER = 1.3;
var RECONNECT_DELAY_RESET_TIMEOUT = 30000; // Reset delay back to MIN_DELAY after being connected for 30sec.
var SERVER_KILL_INTERRUPT_REASON = 'server_kill';
// If auth fails repeatedly, we'll assume something is wrong and log a warning / back off.
var INVALID_TOKEN_THRESHOLD = 3;
/**
 * Firebase connection.  Abstracts wire protocol and handles reconnecting.
 *
 * NOTE: All JSON objects sent to the realtime connection must have property names enclosed
 * in quotes to make sure the closure compiler does not minify them.
 */
var PersistentConnection = /** @class */ (function (_super) {
    tslib.__extends(PersistentConnection, _super);
    /**
     * @param repoInfo_ - Data about the namespace we are connecting to
     * @param applicationId_ - The Firebase App ID for this project
     * @param onDataUpdate_ - A callback for new data from the server
     */
    function PersistentConnection(repoInfo_, applicationId_, onDataUpdate_, onConnectStatus_, onServerInfoUpdate_, authTokenProvider_, appCheckTokenProvider_, authOverride_) {
        var _this = _super.call(this) || this;
        _this.repoInfo_ = repoInfo_;
        _this.applicationId_ = applicationId_;
        _this.onDataUpdate_ = onDataUpdate_;
        _this.onConnectStatus_ = onConnectStatus_;
        _this.onServerInfoUpdate_ = onServerInfoUpdate_;
        _this.authTokenProvider_ = authTokenProvider_;
        _this.appCheckTokenProvider_ = appCheckTokenProvider_;
        _this.authOverride_ = authOverride_;
        // Used for diagnostic logging.
        _this.id = PersistentConnection.nextPersistentConnectionId_++;
        _this.log_ = logWrapper('p:' + _this.id + ':');
        _this.interruptReasons_ = {};
        _this.listens = new Map();
        _this.outstandingPuts_ = [];
        _this.outstandingGets_ = [];
        _this.outstandingPutCount_ = 0;
        _this.outstandingGetCount_ = 0;
        _this.onDisconnectRequestQueue_ = [];
        _this.connected_ = false;
        _this.reconnectDelay_ = RECONNECT_MIN_DELAY;
        _this.maxReconnectDelay_ = RECONNECT_MAX_DELAY_DEFAULT;
        _this.securityDebugCallback_ = null;
        _this.lastSessionId = null;
        _this.establishConnectionTimer_ = null;
        _this.visible_ = false;
        // Before we get connected, we keep a queue of pending messages to send.
        _this.requestCBHash_ = {};
        _this.requestNumber_ = 0;
        _this.realtime_ = null;
        _this.authToken_ = null;
        _this.appCheckToken_ = null;
        _this.forceTokenRefresh_ = false;
        _this.invalidAuthTokenCount_ = 0;
        _this.invalidAppCheckTokenCount_ = 0;
        _this.firstConnection_ = true;
        _this.lastConnectionAttemptTime_ = null;
        _this.lastConnectionEstablishedTime_ = null;
        if (authOverride_ && !util.isNodeSdk()) {
            throw new Error('Auth override specified in options, but not supported on non Node.js platforms');
        }
        VisibilityMonitor.getInstance().on('visible', _this.onVisible_, _this);
        if (repoInfo_.host.indexOf('fblocal') === -1) {
            OnlineMonitor.getInstance().on('online', _this.onOnline_, _this);
        }
        return _this;
    }
    PersistentConnection.prototype.sendRequest = function (action, body, onResponse) {
        var curReqNum = ++this.requestNumber_;
        var msg = { r: curReqNum, a: action, b: body };
        this.log_(util.stringify(msg));
        util.assert(this.connected_, "sendRequest call when we're not connected not allowed.");
        this.realtime_.sendRequest(msg);
        if (onResponse) {
            this.requestCBHash_[curReqNum] = onResponse;
        }
    };
    PersistentConnection.prototype.get = function (query) {
        this.initConnection_();
        var deferred = new util.Deferred();
        var request = {
            p: query._path.toString(),
            q: query._queryObject
        };
        var outstandingGet = {
            action: 'g',
            request: request,
            onComplete: function (message) {
                var payload = message['d'];
                if (message['s'] === 'ok') {
                    deferred.resolve(payload);
                }
                else {
                    deferred.reject(payload);
                }
            }
        };
        this.outstandingGets_.push(outstandingGet);
        this.outstandingGetCount_++;
        var index = this.outstandingGets_.length - 1;
        if (this.connected_) {
            this.sendGet_(index);
        }
        return deferred.promise;
    };
    PersistentConnection.prototype.listen = function (query, currentHashFn, tag, onComplete) {
        this.initConnection_();
        var queryId = query._queryIdentifier;
        var pathString = query._path.toString();
        this.log_('Listen called for ' + pathString + ' ' + queryId);
        if (!this.listens.has(pathString)) {
            this.listens.set(pathString, new Map());
        }
        util.assert(query._queryParams.isDefault() || !query._queryParams.loadsAllData(), 'listen() called for non-default but complete query');
        util.assert(!this.listens.get(pathString).has(queryId), "listen() called twice for same path/queryId.");
        var listenSpec = {
            onComplete: onComplete,
            hashFn: currentHashFn,
            query: query,
            tag: tag
        };
        this.listens.get(pathString).set(queryId, listenSpec);
        if (this.connected_) {
            this.sendListen_(listenSpec);
        }
    };
    PersistentConnection.prototype.sendGet_ = function (index) {
        var _this = this;
        var get = this.outstandingGets_[index];
        this.sendRequest('g', get.request, function (message) {
            delete _this.outstandingGets_[index];
            _this.outstandingGetCount_--;
            if (_this.outstandingGetCount_ === 0) {
                _this.outstandingGets_ = [];
            }
            if (get.onComplete) {
                get.onComplete(message);
            }
        });
    };
    PersistentConnection.prototype.sendListen_ = function (listenSpec) {
        var _this = this;
        var query = listenSpec.query;
        var pathString = query._path.toString();
        var queryId = query._queryIdentifier;
        this.log_('Listen on ' + pathString + ' for ' + queryId);
        var req = { /*path*/ p: pathString };
        var action = 'q';
        // Only bother to send query if it's non-default.
        if (listenSpec.tag) {
            req['q'] = query._queryObject;
            req['t'] = listenSpec.tag;
        }
        req[ /*hash*/'h'] = listenSpec.hashFn();
        this.sendRequest(action, req, function (message) {
            var payload = message[ /*data*/'d'];
            var status = message[ /*status*/'s'];
            // print warnings in any case...
            PersistentConnection.warnOnListenWarnings_(payload, query);
            var currentListenSpec = _this.listens.get(pathString) &&
                _this.listens.get(pathString).get(queryId);
            // only trigger actions if the listen hasn't been removed and readded
            if (currentListenSpec === listenSpec) {
                _this.log_('listen response', message);
                if (status !== 'ok') {
                    _this.removeListen_(pathString, queryId);
                }
                if (listenSpec.onComplete) {
                    listenSpec.onComplete(status, payload);
                }
            }
        });
    };
    PersistentConnection.warnOnListenWarnings_ = function (payload, query) {
        if (payload && typeof payload === 'object' && util.contains(payload, 'w')) {
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            var warnings = util.safeGet(payload, 'w');
            if (Array.isArray(warnings) && ~warnings.indexOf('no_index')) {
                var indexSpec = '".indexOn": "' + query._queryParams.getIndex().toString() + '"';
                var indexPath = query._path.toString();
                warn$1("Using an unspecified index. Your data will be downloaded and " +
                    ("filtered on the client. Consider adding " + indexSpec + " at ") +
                    (indexPath + " to your security rules for better performance."));
            }
        }
    };
    PersistentConnection.prototype.refreshAuthToken = function (token) {
        this.authToken_ = token;
        this.log_('Auth token refreshed');
        if (this.authToken_) {
            this.tryAuth();
        }
        else {
            //If we're connected we want to let the server know to unauthenticate us. If we're not connected, simply delete
            //the credential so we dont become authenticated next time we connect.
            if (this.connected_) {
                this.sendRequest('unauth', {}, function () { });
            }
        }
        this.reduceReconnectDelayIfAdminCredential_(token);
    };
    PersistentConnection.prototype.reduceReconnectDelayIfAdminCredential_ = function (credential) {
        // NOTE: This isn't intended to be bulletproof (a malicious developer can always just modify the client).
        // Additionally, we don't bother resetting the max delay back to the default if auth fails / expires.
        var isFirebaseSecret = credential && credential.length === 40;
        if (isFirebaseSecret || util.isAdmin(credential)) {
            this.log_('Admin auth credential detected.  Reducing max reconnect time.');
            this.maxReconnectDelay_ = RECONNECT_MAX_DELAY_FOR_ADMINS;
        }
    };
    PersistentConnection.prototype.refreshAppCheckToken = function (token) {
        this.appCheckToken_ = token;
        this.log_('App check token refreshed');
        if (this.appCheckToken_) {
            this.tryAppCheck();
        }
        else {
            //If we're connected we want to let the server know to unauthenticate us.
            //If we're not connected, simply delete the credential so we dont become
            // authenticated next time we connect.
            if (this.connected_) {
                this.sendRequest('unappeck', {}, function () { });
            }
        }
    };
    /**
     * Attempts to authenticate with the given credentials. If the authentication attempt fails, it's triggered like
     * a auth revoked (the connection is closed).
     */
    PersistentConnection.prototype.tryAuth = function () {
        var _this = this;
        if (this.connected_ && this.authToken_) {
            var token_1 = this.authToken_;
            var authMethod = util.isValidFormat(token_1) ? 'auth' : 'gauth';
            var requestData = { cred: token_1 };
            if (this.authOverride_ === null) {
                requestData['noauth'] = true;
            }
            else if (typeof this.authOverride_ === 'object') {
                requestData['authvar'] = this.authOverride_;
            }
            this.sendRequest(authMethod, requestData, function (res) {
                var status = res[ /*status*/'s'];
                var data = res[ /*data*/'d'] || 'error';
                if (_this.authToken_ === token_1) {
                    if (status === 'ok') {
                        _this.invalidAuthTokenCount_ = 0;
                    }
                    else {
                        // Triggers reconnect and force refresh for auth token
                        _this.onAuthRevoked_(status, data);
                    }
                }
            });
        }
    };
    /**
     * Attempts to authenticate with the given token. If the authentication
     * attempt fails, it's triggered like the token was revoked (the connection is
     * closed).
     */
    PersistentConnection.prototype.tryAppCheck = function () {
        var _this = this;
        if (this.connected_ && this.appCheckToken_) {
            this.sendRequest('appcheck', { 'token': this.appCheckToken_ }, function (res) {
                var status = res[ /*status*/'s'];
                var data = res[ /*data*/'d'] || 'error';
                if (status === 'ok') {
                    _this.invalidAppCheckTokenCount_ = 0;
                }
                else {
                    _this.onAppCheckRevoked_(status, data);
                }
            });
        }
    };
    /**
     * @inheritDoc
     */
    PersistentConnection.prototype.unlisten = function (query, tag) {
        var pathString = query._path.toString();
        var queryId = query._queryIdentifier;
        this.log_('Unlisten called for ' + pathString + ' ' + queryId);
        util.assert(query._queryParams.isDefault() || !query._queryParams.loadsAllData(), 'unlisten() called for non-default but complete query');
        var listen = this.removeListen_(pathString, queryId);
        if (listen && this.connected_) {
            this.sendUnlisten_(pathString, queryId, query._queryObject, tag);
        }
    };
    PersistentConnection.prototype.sendUnlisten_ = function (pathString, queryId, queryObj, tag) {
        this.log_('Unlisten on ' + pathString + ' for ' + queryId);
        var req = { /*path*/ p: pathString };
        var action = 'n';
        // Only bother sending queryId if it's non-default.
        if (tag) {
            req['q'] = queryObj;
            req['t'] = tag;
        }
        this.sendRequest(action, req);
    };
    PersistentConnection.prototype.onDisconnectPut = function (pathString, data, onComplete) {
        this.initConnection_();
        if (this.connected_) {
            this.sendOnDisconnect_('o', pathString, data, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString: pathString,
                action: 'o',
                data: data,
                onComplete: onComplete
            });
        }
    };
    PersistentConnection.prototype.onDisconnectMerge = function (pathString, data, onComplete) {
        this.initConnection_();
        if (this.connected_) {
            this.sendOnDisconnect_('om', pathString, data, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString: pathString,
                action: 'om',
                data: data,
                onComplete: onComplete
            });
        }
    };
    PersistentConnection.prototype.onDisconnectCancel = function (pathString, onComplete) {
        this.initConnection_();
        if (this.connected_) {
            this.sendOnDisconnect_('oc', pathString, null, onComplete);
        }
        else {
            this.onDisconnectRequestQueue_.push({
                pathString: pathString,
                action: 'oc',
                data: null,
                onComplete: onComplete
            });
        }
    };
    PersistentConnection.prototype.sendOnDisconnect_ = function (action, pathString, data, onComplete) {
        var request = { /*path*/ p: pathString, /*data*/ d: data };
        this.log_('onDisconnect ' + action, request);
        this.sendRequest(action, request, function (response) {
            if (onComplete) {
                setTimeout(function () {
                    onComplete(response[ /*status*/'s'], response[ /* data */'d']);
                }, Math.floor(0));
            }
        });
    };
    PersistentConnection.prototype.put = function (pathString, data, onComplete, hash) {
        this.putInternal('p', pathString, data, onComplete, hash);
    };
    PersistentConnection.prototype.merge = function (pathString, data, onComplete, hash) {
        this.putInternal('m', pathString, data, onComplete, hash);
    };
    PersistentConnection.prototype.putInternal = function (action, pathString, data, onComplete, hash) {
        this.initConnection_();
        var request = {
            /*path*/ p: pathString,
            /*data*/ d: data
        };
        if (hash !== undefined) {
            request[ /*hash*/'h'] = hash;
        }
        // TODO: Only keep track of the most recent put for a given path?
        this.outstandingPuts_.push({
            action: action,
            request: request,
            onComplete: onComplete
        });
        this.outstandingPutCount_++;
        var index = this.outstandingPuts_.length - 1;
        if (this.connected_) {
            this.sendPut_(index);
        }
        else {
            this.log_('Buffering put: ' + pathString);
        }
    };
    PersistentConnection.prototype.sendPut_ = function (index) {
        var _this = this;
        var action = this.outstandingPuts_[index].action;
        var request = this.outstandingPuts_[index].request;
        var onComplete = this.outstandingPuts_[index].onComplete;
        this.outstandingPuts_[index].queued = this.connected_;
        this.sendRequest(action, request, function (message) {
            _this.log_(action + ' response', message);
            delete _this.outstandingPuts_[index];
            _this.outstandingPutCount_--;
            // Clean up array occasionally.
            if (_this.outstandingPutCount_ === 0) {
                _this.outstandingPuts_ = [];
            }
            if (onComplete) {
                onComplete(message[ /*status*/'s'], message[ /* data */'d']);
            }
        });
    };
    PersistentConnection.prototype.reportStats = function (stats) {
        var _this = this;
        // If we're not connected, we just drop the stats.
        if (this.connected_) {
            var request = { /*counters*/ c: stats };
            this.log_('reportStats', request);
            this.sendRequest(/*stats*/ 's', request, function (result) {
                var status = result[ /*status*/'s'];
                if (status !== 'ok') {
                    var errorReason = result[ /* data */'d'];
                    _this.log_('reportStats', 'Error sending stats: ' + errorReason);
                }
            });
        }
    };
    PersistentConnection.prototype.onDataMessage_ = function (message) {
        if ('r' in message) {
            // this is a response
            this.log_('from server: ' + util.stringify(message));
            var reqNum = message['r'];
            var onResponse = this.requestCBHash_[reqNum];
            if (onResponse) {
                delete this.requestCBHash_[reqNum];
                onResponse(message[ /*body*/'b']);
            }
        }
        else if ('error' in message) {
            throw 'A server-side error has occurred: ' + message['error'];
        }
        else if ('a' in message) {
            // a and b are action and body, respectively
            this.onDataPush_(message['a'], message['b']);
        }
    };
    PersistentConnection.prototype.onDataPush_ = function (action, body) {
        this.log_('handleServerMessage', action, body);
        if (action === 'd') {
            this.onDataUpdate_(body[ /*path*/'p'], body[ /*data*/'d'], 
            /*isMerge*/ false, body['t']);
        }
        else if (action === 'm') {
            this.onDataUpdate_(body[ /*path*/'p'], body[ /*data*/'d'], 
            /*isMerge=*/ true, body['t']);
        }
        else if (action === 'c') {
            this.onListenRevoked_(body[ /*path*/'p'], body[ /*query*/'q']);
        }
        else if (action === 'ac') {
            this.onAuthRevoked_(body[ /*status code*/'s'], body[ /* explanation */'d']);
        }
        else if (action === 'apc') {
            this.onAppCheckRevoked_(body[ /*status code*/'s'], body[ /* explanation */'d']);
        }
        else if (action === 'sd') {
            this.onSecurityDebugPacket_(body);
        }
        else {
            error('Unrecognized action received from server: ' +
                util.stringify(action) +
                '\nAre you using the latest client?');
        }
    };
    PersistentConnection.prototype.onReady_ = function (timestamp, sessionId) {
        this.log_('connection ready');
        this.connected_ = true;
        this.lastConnectionEstablishedTime_ = new Date().getTime();
        this.handleTimestamp_(timestamp);
        this.lastSessionId = sessionId;
        if (this.firstConnection_) {
            this.sendConnectStats_();
        }
        this.restoreState_();
        this.firstConnection_ = false;
        this.onConnectStatus_(true);
    };
    PersistentConnection.prototype.scheduleConnect_ = function (timeout) {
        var _this = this;
        util.assert(!this.realtime_, "Scheduling a connect when we're already connected/ing?");
        if (this.establishConnectionTimer_) {
            clearTimeout(this.establishConnectionTimer_);
        }
        // NOTE: Even when timeout is 0, it's important to do a setTimeout to work around an infuriating "Security Error" in
        // Firefox when trying to write to our long-polling iframe in some scenarios (e.g. Forge or our unit tests).
        this.establishConnectionTimer_ = setTimeout(function () {
            _this.establishConnectionTimer_ = null;
            _this.establishConnection_();
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
        }, Math.floor(timeout));
    };
    PersistentConnection.prototype.initConnection_ = function () {
        if (!this.realtime_ && this.firstConnection_) {
            this.scheduleConnect_(0);
        }
    };
    PersistentConnection.prototype.onVisible_ = function (visible) {
        // NOTE: Tabbing away and back to a window will defeat our reconnect backoff, but I think that's fine.
        if (visible &&
            !this.visible_ &&
            this.reconnectDelay_ === this.maxReconnectDelay_) {
            this.log_('Window became visible.  Reducing delay.');
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
        this.visible_ = visible;
    };
    PersistentConnection.prototype.onOnline_ = function (online) {
        if (online) {
            this.log_('Browser went online.');
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
        else {
            this.log_('Browser went offline.  Killing connection.');
            if (this.realtime_) {
                this.realtime_.close();
            }
        }
    };
    PersistentConnection.prototype.onRealtimeDisconnect_ = function () {
        this.log_('data client disconnected');
        this.connected_ = false;
        this.realtime_ = null;
        // Since we don't know if our sent transactions succeeded or not, we need to cancel them.
        this.cancelSentTransactions_();
        // Clear out the pending requests.
        this.requestCBHash_ = {};
        if (this.shouldReconnect_()) {
            if (!this.visible_) {
                this.log_("Window isn't visible.  Delaying reconnect.");
                this.reconnectDelay_ = this.maxReconnectDelay_;
                this.lastConnectionAttemptTime_ = new Date().getTime();
            }
            else if (this.lastConnectionEstablishedTime_) {
                // If we've been connected long enough, reset reconnect delay to minimum.
                var timeSinceLastConnectSucceeded = new Date().getTime() - this.lastConnectionEstablishedTime_;
                if (timeSinceLastConnectSucceeded > RECONNECT_DELAY_RESET_TIMEOUT) {
                    this.reconnectDelay_ = RECONNECT_MIN_DELAY;
                }
                this.lastConnectionEstablishedTime_ = null;
            }
            var timeSinceLastConnectAttempt = new Date().getTime() - this.lastConnectionAttemptTime_;
            var reconnectDelay = Math.max(0, this.reconnectDelay_ - timeSinceLastConnectAttempt);
            reconnectDelay = Math.random() * reconnectDelay;
            this.log_('Trying to reconnect in ' + reconnectDelay + 'ms');
            this.scheduleConnect_(reconnectDelay);
            // Adjust reconnect delay for next time.
            this.reconnectDelay_ = Math.min(this.maxReconnectDelay_, this.reconnectDelay_ * RECONNECT_DELAY_MULTIPLIER);
        }
        this.onConnectStatus_(false);
    };
    PersistentConnection.prototype.establishConnection_ = function () {
        return tslib.__awaiter(this, void 0, void 0, function () {
            var onDataMessage, onReady, onDisconnect_1, connId, lastSessionId, canceled_1, connection_1, closeFn, sendRequestFn, forceRefresh, _a, authToken, appCheckToken, error_1;
            var _this = this;
            return tslib.__generator(this, function (_b) {
                switch (_b.label) {
                    case 0:
                        if (!this.shouldReconnect_()) return [3 /*break*/, 4];
                        this.log_('Making a connection attempt');
                        this.lastConnectionAttemptTime_ = new Date().getTime();
                        this.lastConnectionEstablishedTime_ = null;
                        onDataMessage = this.onDataMessage_.bind(this);
                        onReady = this.onReady_.bind(this);
                        onDisconnect_1 = this.onRealtimeDisconnect_.bind(this);
                        connId = this.id + ':' + PersistentConnection.nextConnectionId_++;
                        lastSessionId = this.lastSessionId;
                        canceled_1 = false;
                        connection_1 = null;
                        closeFn = function () {
                            if (connection_1) {
                                connection_1.close();
                            }
                            else {
                                canceled_1 = true;
                                onDisconnect_1();
                            }
                        };
                        sendRequestFn = function (msg) {
                            util.assert(connection_1, "sendRequest call when we're not connected not allowed.");
                            connection_1.sendRequest(msg);
                        };
                        this.realtime_ = {
                            close: closeFn,
                            sendRequest: sendRequestFn
                        };
                        forceRefresh = this.forceTokenRefresh_;
                        this.forceTokenRefresh_ = false;
                        _b.label = 1;
                    case 1:
                        _b.trys.push([1, 3, , 4]);
                        return [4 /*yield*/, Promise.all([
                                this.authTokenProvider_.getToken(forceRefresh),
                                this.appCheckTokenProvider_.getToken(forceRefresh)
                            ])];
                    case 2:
                        _a = tslib.__read.apply(void 0, [_b.sent(), 2]), authToken = _a[0], appCheckToken = _a[1];
                        if (!canceled_1) {
                            log('getToken() completed. Creating connection.');
                            this.authToken_ = authToken && authToken.accessToken;
                            this.appCheckToken_ = appCheckToken && appCheckToken.token;
                            connection_1 = new Connection(connId, this.repoInfo_, this.applicationId_, this.appCheckToken_, this.authToken_, onDataMessage, onReady, onDisconnect_1, 
                            /* onKill= */ function (reason) {
                                warn$1(reason + ' (' + _this.repoInfo_.toString() + ')');
                                _this.interrupt(SERVER_KILL_INTERRUPT_REASON);
                            }, lastSessionId);
                        }
                        else {
                            log('getToken() completed but was canceled');
                        }
                        return [3 /*break*/, 4];
                    case 3:
                        error_1 = _b.sent();
                        this.log_('Failed to get token: ' + error_1);
                        if (!canceled_1) {
                            if (this.repoInfo_.nodeAdmin) {
                                // This may be a critical error for the Admin Node.js SDK, so log a warning.
                                // But getToken() may also just have temporarily failed, so we still want to
                                // continue retrying.
                                warn$1(error_1);
                            }
                            closeFn();
                        }
                        return [3 /*break*/, 4];
                    case 4: return [2 /*return*/];
                }
            });
        });
    };
    PersistentConnection.prototype.interrupt = function (reason) {
        log('Interrupting connection for reason: ' + reason);
        this.interruptReasons_[reason] = true;
        if (this.realtime_) {
            this.realtime_.close();
        }
        else {
            if (this.establishConnectionTimer_) {
                clearTimeout(this.establishConnectionTimer_);
                this.establishConnectionTimer_ = null;
            }
            if (this.connected_) {
                this.onRealtimeDisconnect_();
            }
        }
    };
    PersistentConnection.prototype.resume = function (reason) {
        log('Resuming connection for reason: ' + reason);
        delete this.interruptReasons_[reason];
        if (util.isEmpty(this.interruptReasons_)) {
            this.reconnectDelay_ = RECONNECT_MIN_DELAY;
            if (!this.realtime_) {
                this.scheduleConnect_(0);
            }
        }
    };
    PersistentConnection.prototype.handleTimestamp_ = function (timestamp) {
        var delta = timestamp - new Date().getTime();
        this.onServerInfoUpdate_({ serverTimeOffset: delta });
    };
    PersistentConnection.prototype.cancelSentTransactions_ = function () {
        for (var i = 0; i < this.outstandingPuts_.length; i++) {
            var put = this.outstandingPuts_[i];
            if (put && /*hash*/ 'h' in put.request && put.queued) {
                if (put.onComplete) {
                    put.onComplete('disconnect');
                }
                delete this.outstandingPuts_[i];
                this.outstandingPutCount_--;
            }
        }
        // Clean up array occasionally.
        if (this.outstandingPutCount_ === 0) {
            this.outstandingPuts_ = [];
        }
    };
    PersistentConnection.prototype.onListenRevoked_ = function (pathString, query) {
        // Remove the listen and manufacture a "permission_denied" error for the failed listen.
        var queryId;
        if (!query) {
            queryId = 'default';
        }
        else {
            queryId = query.map(function (q) { return ObjectToUniqueKey(q); }).join('$');
        }
        var listen = this.removeListen_(pathString, queryId);
        if (listen && listen.onComplete) {
            listen.onComplete('permission_denied');
        }
    };
    PersistentConnection.prototype.removeListen_ = function (pathString, queryId) {
        var normalizedPathString = new Path(pathString).toString(); // normalize path.
        var listen;
        if (this.listens.has(normalizedPathString)) {
            var map = this.listens.get(normalizedPathString);
            listen = map.get(queryId);
            map.delete(queryId);
            if (map.size === 0) {
                this.listens.delete(normalizedPathString);
            }
        }
        else {
            // all listens for this path has already been removed
            listen = undefined;
        }
        return listen;
    };
    PersistentConnection.prototype.onAuthRevoked_ = function (statusCode, explanation) {
        log('Auth token revoked: ' + statusCode + '/' + explanation);
        this.authToken_ = null;
        this.forceTokenRefresh_ = true;
        this.realtime_.close();
        if (statusCode === 'invalid_token' || statusCode === 'permission_denied') {
            // We'll wait a couple times before logging the warning / increasing the
            // retry period since oauth tokens will report as "invalid" if they're
            // just expired. Plus there may be transient issues that resolve themselves.
            this.invalidAuthTokenCount_++;
            if (this.invalidAuthTokenCount_ >= INVALID_TOKEN_THRESHOLD) {
                // Set a long reconnect delay because recovery is unlikely
                this.reconnectDelay_ = RECONNECT_MAX_DELAY_FOR_ADMINS;
                // Notify the auth token provider that the token is invalid, which will log
                // a warning
                this.authTokenProvider_.notifyForInvalidToken();
            }
        }
    };
    PersistentConnection.prototype.onAppCheckRevoked_ = function (statusCode, explanation) {
        log('App check token revoked: ' + statusCode + '/' + explanation);
        this.appCheckToken_ = null;
        this.forceTokenRefresh_ = true;
        // Note: We don't close the connection as the developer may not have
        // enforcement enabled. The backend closes connections with enforcements.
        if (statusCode === 'invalid_token' || statusCode === 'permission_denied') {
            // We'll wait a couple times before logging the warning / increasing the
            // retry period since oauth tokens will report as "invalid" if they're
            // just expired. Plus there may be transient issues that resolve themselves.
            this.invalidAppCheckTokenCount_++;
            if (this.invalidAppCheckTokenCount_ >= INVALID_TOKEN_THRESHOLD) {
                this.appCheckTokenProvider_.notifyForInvalidToken();
            }
        }
    };
    PersistentConnection.prototype.onSecurityDebugPacket_ = function (body) {
        if (this.securityDebugCallback_) {
            this.securityDebugCallback_(body);
        }
        else {
            if ('msg' in body) {
                console.log('FIREBASE: ' + body['msg'].replace('\n', '\nFIREBASE: '));
            }
        }
    };
    PersistentConnection.prototype.restoreState_ = function () {
        var e_1, _a, e_2, _b;
        //Re-authenticate ourselves if we have a credential stored.
        this.tryAuth();
        this.tryAppCheck();
        try {
            // Puts depend on having received the corresponding data update from the server before they complete, so we must
            // make sure to send listens before puts.
            for (var _c = tslib.__values(this.listens.values()), _d = _c.next(); !_d.done; _d = _c.next()) {
                var queries = _d.value;
                try {
                    for (var _e = (e_2 = void 0, tslib.__values(queries.values())), _f = _e.next(); !_f.done; _f = _e.next()) {
                        var listenSpec = _f.value;
                        this.sendListen_(listenSpec);
                    }
                }
                catch (e_2_1) { e_2 = { error: e_2_1 }; }
                finally {
                    try {
                        if (_f && !_f.done && (_b = _e.return)) _b.call(_e);
                    }
                    finally { if (e_2) throw e_2.error; }
                }
            }
        }
        catch (e_1_1) { e_1 = { error: e_1_1 }; }
        finally {
            try {
                if (_d && !_d.done && (_a = _c.return)) _a.call(_c);
            }
            finally { if (e_1) throw e_1.error; }
        }
        for (var i = 0; i < this.outstandingPuts_.length; i++) {
            if (this.outstandingPuts_[i]) {
                this.sendPut_(i);
            }
        }
        while (this.onDisconnectRequestQueue_.length) {
            var request = this.onDisconnectRequestQueue_.shift();
            this.sendOnDisconnect_(request.action, request.pathString, request.data, request.onComplete);
        }
        for (var i = 0; i < this.outstandingGets_.length; i++) {
            if (this.outstandingGets_[i]) {
                this.sendGet_(i);
            }
        }
    };
    /**
     * Sends client stats for first connection
     */
    PersistentConnection.prototype.sendConnectStats_ = function () {
        var stats = {};
        var clientName = 'js';
        if (util.isNodeSdk()) {
            if (this.repoInfo_.nodeAdmin) {
                clientName = 'admin_node';
            }
            else {
                clientName = 'node';
            }
        }
        stats['sdk.' + clientName + '.' + SDK_VERSION.replace(/\./g, '-')] = 1;
        if (util.isMobileCordova()) {
            stats['framework.cordova'] = 1;
        }
        else if (util.isReactNative()) {
            stats['framework.reactnative'] = 1;
        }
        this.reportStats(stats);
    };
    PersistentConnection.prototype.shouldReconnect_ = function () {
        var online = OnlineMonitor.getInstance().currentlyOnline();
        return util.isEmpty(this.interruptReasons_) && online;
    };
    PersistentConnection.nextPersistentConnectionId_ = 0;
    /**
     * Counter for number of connections created. Mainly used for tagging in the logs
     */
    PersistentConnection.nextConnectionId_ = 0;
    return PersistentConnection;
}(ServerActions));

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var referenceConstructor;
function syncTreeSetReferenceConstructor(val) {
    util.assert(!referenceConstructor, '__referenceConstructor has already been defined');
    referenceConstructor = val;
}
function syncTreeGetReferenceConstructor() {
    util.assert(referenceConstructor, 'Reference.ts has not been loaded');
    return referenceConstructor;
}
/**
 * Static tracker for next query tag.
 */
var syncTreeNextQueryTag_ = 1;
/**
 * SyncTree is the central class for managing event callback registration, data caching, views
 * (query processing), and event generation.  There are typically two SyncTree instances for
 * each Repo, one for the normal Firebase data, and one for the .info data.
 *
 * It has a number of responsibilities, including:
 *  - Tracking all user event callbacks (registered via addEventRegistration() and removeEventRegistration()).
 *  - Applying and caching data changes for user set(), transaction(), and update() calls
 *    (applyUserOverwrite(), applyUserMerge()).
 *  - Applying and caching data changes for server data changes (applyServerOverwrite(),
 *    applyServerMerge()).
 *  - Generating user-facing events for server and user changes (all of the apply* methods
 *    return the set of events that need to be raised as a result).
 *  - Maintaining the appropriate set of server listens to ensure we are always subscribed
 *    to the correct set of paths and queries to satisfy the current set of user event
 *    callbacks (listens are started/stopped using the provided listenProvider).
 *
 * NOTE: Although SyncTree tracks event callbacks and calculates events to raise, the actual
 * events are returned to the caller rather than raised synchronously.
 *
 */
var SyncTree = /** @class */ (function () {
    /**
     * @param listenProvider_ - Used by SyncTree to start / stop listening
     *   to server data.
     */
    function SyncTree(listenProvider_) {
        this.listenProvider_ = listenProvider_;
        /**
         * Tree of SyncPoints.  There's a SyncPoint at any location that has 1 or more views.
         */
        this.syncPointTree_ = new ImmutableTree(null);
        /**
         * A tree of all pending user writes (user-initiated set()'s, transaction()'s, update()'s, etc.).
         */
        this.pendingWriteTree_ = newWriteTree();
        this.tagToQueryMap = new Map();
        this.queryToTagMap = new Map();
    }
    return SyncTree;
}());
/**
 * Apply the data changes for a user-generated set() or transaction() call.
 *
 * @returns Events to raise.
 */
function syncTreeApplyUserOverwrite(syncTree, path, newData, writeId, visible) {
    // Record pending write.
    writeTreeAddOverwrite(syncTree.pendingWriteTree_, path, newData, writeId, visible);
    if (!visible) {
        return [];
    }
    else {
        return syncTreeApplyOperationToSyncPoints_(syncTree, new Overwrite(newOperationSourceUser(), path, newData));
    }
}
/**
 * Apply the data from a user-generated update() call
 *
 * @returns Events to raise.
 */
function syncTreeApplyUserMerge(syncTree, path, changedChildren, writeId) {
    // Record pending merge.
    writeTreeAddMerge(syncTree.pendingWriteTree_, path, changedChildren, writeId);
    var changeTree = ImmutableTree.fromObject(changedChildren);
    return syncTreeApplyOperationToSyncPoints_(syncTree, new Merge(newOperationSourceUser(), path, changeTree));
}
/**
 * Acknowledge a pending user write that was previously registered with applyUserOverwrite() or applyUserMerge().
 *
 * @param revert - True if the given write failed and needs to be reverted
 * @returns Events to raise.
 */
function syncTreeAckUserWrite(syncTree, writeId, revert) {
    if (revert === void 0) { revert = false; }
    var write = writeTreeGetWrite(syncTree.pendingWriteTree_, writeId);
    var needToReevaluate = writeTreeRemoveWrite(syncTree.pendingWriteTree_, writeId);
    if (!needToReevaluate) {
        return [];
    }
    else {
        var affectedTree_1 = new ImmutableTree(null);
        if (write.snap != null) {
            // overwrite
            affectedTree_1 = affectedTree_1.set(newEmptyPath(), true);
        }
        else {
            each(write.children, function (pathString) {
                affectedTree_1 = affectedTree_1.set(new Path(pathString), true);
            });
        }
        return syncTreeApplyOperationToSyncPoints_(syncTree, new AckUserWrite(write.path, affectedTree_1, revert));
    }
}
/**
 * Apply new server data for the specified path..
 *
 * @returns Events to raise.
 */
function syncTreeApplyServerOverwrite(syncTree, path, newData) {
    return syncTreeApplyOperationToSyncPoints_(syncTree, new Overwrite(newOperationSourceServer(), path, newData));
}
/**
 * Apply new server data to be merged in at the specified path.
 *
 * @returns Events to raise.
 */
function syncTreeApplyServerMerge(syncTree, path, changedChildren) {
    var changeTree = ImmutableTree.fromObject(changedChildren);
    return syncTreeApplyOperationToSyncPoints_(syncTree, new Merge(newOperationSourceServer(), path, changeTree));
}
/**
 * Apply a listen complete for a query
 *
 * @returns Events to raise.
 */
function syncTreeApplyListenComplete(syncTree, path) {
    return syncTreeApplyOperationToSyncPoints_(syncTree, new ListenComplete(newOperationSourceServer(), path));
}
/**
 * Apply a listen complete for a tagged query
 *
 * @returns Events to raise.
 */
function syncTreeApplyTaggedListenComplete(syncTree, path, tag) {
    var queryKey = syncTreeQueryKeyForTag_(syncTree, tag);
    if (queryKey) {
        var r = syncTreeParseQueryKey_(queryKey);
        var queryPath = r.path, queryId = r.queryId;
        var relativePath = newRelativePath(queryPath, path);
        var op = new ListenComplete(newOperationSourceServerTaggedQuery(queryId), relativePath);
        return syncTreeApplyTaggedOperation_(syncTree, queryPath, op);
    }
    else {
        // We've already removed the query. No big deal, ignore the update
        return [];
    }
}
/**
 * Remove event callback(s).
 *
 * If query is the default query, we'll check all queries for the specified eventRegistration.
 * If eventRegistration is null, we'll remove all callbacks for the specified query/queries.
 *
 * @param eventRegistration - If null, all callbacks are removed.
 * @param cancelError - If a cancelError is provided, appropriate cancel events will be returned.
 * @returns Cancel events, if cancelError was provided.
 */
function syncTreeRemoveEventRegistration(syncTree, query, eventRegistration, cancelError) {
    // Find the syncPoint first. Then deal with whether or not it has matching listeners
    var path = query._path;
    var maybeSyncPoint = syncTree.syncPointTree_.get(path);
    var cancelEvents = [];
    // A removal on a default query affects all queries at that location. A removal on an indexed query, even one without
    // other query constraints, does *not* affect all queries at that location. So this check must be for 'default', and
    // not loadsAllData().
    if (maybeSyncPoint &&
        (query._queryIdentifier === 'default' ||
            syncPointViewExistsForQuery(maybeSyncPoint, query))) {
        var removedAndEvents = syncPointRemoveEventRegistration(maybeSyncPoint, query, eventRegistration, cancelError);
        if (syncPointIsEmpty(maybeSyncPoint)) {
            syncTree.syncPointTree_ = syncTree.syncPointTree_.remove(path);
        }
        var removed = removedAndEvents.removed;
        cancelEvents = removedAndEvents.events;
        // We may have just removed one of many listeners and can short-circuit this whole process
        // We may also not have removed a default listener, in which case all of the descendant listeners should already be
        // properly set up.
        //
        // Since indexed queries can shadow if they don't have other query constraints, check for loadsAllData(), instead of
        // queryId === 'default'
        var removingDefault = -1 !==
            removed.findIndex(function (query) {
                return query._queryParams.loadsAllData();
            });
        var covered = syncTree.syncPointTree_.findOnPath(path, function (relativePath, parentSyncPoint) {
            return syncPointHasCompleteView(parentSyncPoint);
        });
        if (removingDefault && !covered) {
            var subtree = syncTree.syncPointTree_.subtree(path);
            // There are potentially child listeners. Determine what if any listens we need to send before executing the
            // removal
            if (!subtree.isEmpty()) {
                // We need to fold over our subtree and collect the listeners to send
                var newViews = syncTreeCollectDistinctViewsForSubTree_(subtree);
                // Ok, we've collected all the listens we need. Set them up.
                for (var i = 0; i < newViews.length; ++i) {
                    var view = newViews[i], newQuery = view.query;
                    var listener = syncTreeCreateListenerForView_(syncTree, view);
                    syncTree.listenProvider_.startListening(syncTreeQueryForListening_(newQuery), syncTreeTagForQuery_(syncTree, newQuery), listener.hashFn, listener.onComplete);
                }
            }
        }
        // If we removed anything and we're not covered by a higher up listen, we need to stop listening on this query
        // The above block has us covered in terms of making sure we're set up on listens lower in the tree.
        // Also, note that if we have a cancelError, it's already been removed at the provider level.
        if (!covered && removed.length > 0 && !cancelError) {
            // If we removed a default, then we weren't listening on any of the other queries here. Just cancel the one
            // default. Otherwise, we need to iterate through and cancel each individual query
            if (removingDefault) {
                // We don't tag default listeners
                var defaultTag = null;
                syncTree.listenProvider_.stopListening(syncTreeQueryForListening_(query), defaultTag);
            }
            else {
                removed.forEach(function (queryToRemove) {
                    var tagToRemove = syncTree.queryToTagMap.get(syncTreeMakeQueryKey_(queryToRemove));
                    syncTree.listenProvider_.stopListening(syncTreeQueryForListening_(queryToRemove), tagToRemove);
                });
            }
        }
        // Now, clear all of the tags we're tracking for the removed listens
        syncTreeRemoveTags_(syncTree, removed);
    }
    return cancelEvents;
}
/**
 * This function was added to support non-listener queries,
 * specifically for use in repoGetValue. It sets up all the same
 * local cache data-structures (SyncPoint + View) that are
 * needed for listeners without installing an event registration.
 * If `query` is not `loadsAllData`, it will also provision a tag for
 * the query so that query results can be merged into the sync
 * tree using existing logic for tagged listener queries.
 *
 * @param syncTree - Synctree to add the query to.
 * @param query - Query to register
 * @returns tag as a string if query is not a default query, null if query is not.
 */
function syncTreeRegisterQuery(syncTree, query) {
    var _a = syncTreeRegisterSyncPoint(query, syncTree), syncPoint = _a.syncPoint, serverCache = _a.serverCache, writesCache = _a.writesCache, serverCacheComplete = _a.serverCacheComplete;
    var view = syncPointGetView(syncPoint, query, writesCache, serverCache, serverCacheComplete);
    if (!syncPoint.views.has(query._queryIdentifier)) {
        syncPoint.views.set(query._queryIdentifier, view);
    }
    if (!query._queryParams.loadsAllData()) {
        return syncTreeTagForQuery_(syncTree, query);
    }
    return null;
}
/**
 * Apply new server data for the specified tagged query.
 *
 * @returns Events to raise.
 */
function syncTreeApplyTaggedQueryOverwrite(syncTree, path, snap, tag) {
    var queryKey = syncTreeQueryKeyForTag_(syncTree, tag);
    if (queryKey != null) {
        var r = syncTreeParseQueryKey_(queryKey);
        var queryPath = r.path, queryId = r.queryId;
        var relativePath = newRelativePath(queryPath, path);
        var op = new Overwrite(newOperationSourceServerTaggedQuery(queryId), relativePath, snap);
        return syncTreeApplyTaggedOperation_(syncTree, queryPath, op);
    }
    else {
        // Query must have been removed already
        return [];
    }
}
/**
 * Apply server data to be merged in for the specified tagged query.
 *
 * @returns Events to raise.
 */
function syncTreeApplyTaggedQueryMerge(syncTree, path, changedChildren, tag) {
    var queryKey = syncTreeQueryKeyForTag_(syncTree, tag);
    if (queryKey) {
        var r = syncTreeParseQueryKey_(queryKey);
        var queryPath = r.path, queryId = r.queryId;
        var relativePath = newRelativePath(queryPath, path);
        var changeTree = ImmutableTree.fromObject(changedChildren);
        var op = new Merge(newOperationSourceServerTaggedQuery(queryId), relativePath, changeTree);
        return syncTreeApplyTaggedOperation_(syncTree, queryPath, op);
    }
    else {
        // We've already removed the query. No big deal, ignore the update
        return [];
    }
}
/**
 * Creates a new syncpoint for a query and creates a tag if the view doesn't exist.
 * Extracted from addEventRegistration to allow `repoGetValue` to properly set up the SyncTree
 * without actually listening on a query.
 */
function syncTreeRegisterSyncPoint(query, syncTree) {
    var path = query._path;
    var serverCache = null;
    var foundAncestorDefaultView = false;
    // Any covering writes will necessarily be at the root, so really all we need to find is the server cache.
    // Consider optimizing this once there's a better understanding of what actual behavior will be.
    syncTree.syncPointTree_.foreachOnPath(path, function (pathToSyncPoint, sp) {
        var relativePath = newRelativePath(pathToSyncPoint, path);
        serverCache =
            serverCache || syncPointGetCompleteServerCache(sp, relativePath);
        foundAncestorDefaultView =
            foundAncestorDefaultView || syncPointHasCompleteView(sp);
    });
    var syncPoint = syncTree.syncPointTree_.get(path);
    if (!syncPoint) {
        syncPoint = new SyncPoint();
        syncTree.syncPointTree_ = syncTree.syncPointTree_.set(path, syncPoint);
    }
    else {
        foundAncestorDefaultView =
            foundAncestorDefaultView || syncPointHasCompleteView(syncPoint);
        serverCache =
            serverCache || syncPointGetCompleteServerCache(syncPoint, newEmptyPath());
    }
    var serverCacheComplete;
    if (serverCache != null) {
        serverCacheComplete = true;
    }
    else {
        serverCacheComplete = false;
        serverCache = ChildrenNode.EMPTY_NODE;
        var subtree = syncTree.syncPointTree_.subtree(path);
        subtree.foreachChild(function (childName, childSyncPoint) {
            var completeCache = syncPointGetCompleteServerCache(childSyncPoint, newEmptyPath());
            if (completeCache) {
                serverCache = serverCache.updateImmediateChild(childName, completeCache);
            }
        });
    }
    var viewAlreadyExists = syncPointViewExistsForQuery(syncPoint, query);
    if (!viewAlreadyExists && !query._queryParams.loadsAllData()) {
        // We need to track a tag for this query
        var queryKey = syncTreeMakeQueryKey_(query);
        util.assert(!syncTree.queryToTagMap.has(queryKey), 'View does not exist, but we have a tag');
        var tag = syncTreeGetNextQueryTag_();
        syncTree.queryToTagMap.set(queryKey, tag);
        syncTree.tagToQueryMap.set(tag, queryKey);
    }
    var writesCache = writeTreeChildWrites(syncTree.pendingWriteTree_, path);
    return {
        syncPoint: syncPoint,
        writesCache: writesCache,
        serverCache: serverCache,
        serverCacheComplete: serverCacheComplete,
        foundAncestorDefaultView: foundAncestorDefaultView,
        viewAlreadyExists: viewAlreadyExists
    };
}
/**
 * Add an event callback for the specified query.
 *
 * @returns Events to raise.
 */
function syncTreeAddEventRegistration(syncTree, query, eventRegistration) {
    var _a = syncTreeRegisterSyncPoint(query, syncTree), syncPoint = _a.syncPoint, serverCache = _a.serverCache, writesCache = _a.writesCache, serverCacheComplete = _a.serverCacheComplete, viewAlreadyExists = _a.viewAlreadyExists, foundAncestorDefaultView = _a.foundAncestorDefaultView;
    var events = syncPointAddEventRegistration(syncPoint, query, eventRegistration, writesCache, serverCache, serverCacheComplete);
    if (!viewAlreadyExists && !foundAncestorDefaultView) {
        var view = syncPointViewForQuery(syncPoint, query);
        events = events.concat(syncTreeSetupListener_(syncTree, query, view));
    }
    return events;
}
/**
 * Returns a complete cache, if we have one, of the data at a particular path. If the location does not have a
 * listener above it, we will get a false "null". This shouldn't be a problem because transactions will always
 * have a listener above, and atomic operations would correctly show a jitter of <increment value> ->
 *     <incremented total> as the write is applied locally and then acknowledged at the server.
 *
 * Note: this method will *include* hidden writes from transaction with applyLocally set to false.
 *
 * @param path - The path to the data we want
 * @param writeIdsToExclude - A specific set to be excluded
 */
function syncTreeCalcCompleteEventCache(syncTree, path, writeIdsToExclude) {
    var includeHiddenSets = true;
    var writeTree = syncTree.pendingWriteTree_;
    var serverCache = syncTree.syncPointTree_.findOnPath(path, function (pathSoFar, syncPoint) {
        var relativePath = newRelativePath(pathSoFar, path);
        var serverCache = syncPointGetCompleteServerCache(syncPoint, relativePath);
        if (serverCache) {
            return serverCache;
        }
    });
    return writeTreeCalcCompleteEventCache(writeTree, path, serverCache, writeIdsToExclude, includeHiddenSets);
}
function syncTreeGetServerValue(syncTree, query) {
    var path = query._path;
    var serverCache = null;
    // Any covering writes will necessarily be at the root, so really all we need to find is the server cache.
    // Consider optimizing this once there's a better understanding of what actual behavior will be.
    syncTree.syncPointTree_.foreachOnPath(path, function (pathToSyncPoint, sp) {
        var relativePath = newRelativePath(pathToSyncPoint, path);
        serverCache =
            serverCache || syncPointGetCompleteServerCache(sp, relativePath);
    });
    var syncPoint = syncTree.syncPointTree_.get(path);
    if (!syncPoint) {
        syncPoint = new SyncPoint();
        syncTree.syncPointTree_ = syncTree.syncPointTree_.set(path, syncPoint);
    }
    else {
        serverCache =
            serverCache || syncPointGetCompleteServerCache(syncPoint, newEmptyPath());
    }
    var serverCacheComplete = serverCache != null;
    var serverCacheNode = serverCacheComplete
        ? new CacheNode(serverCache, true, false)
        : null;
    var writesCache = writeTreeChildWrites(syncTree.pendingWriteTree_, query._path);
    var view = syncPointGetView(syncPoint, query, writesCache, serverCacheComplete ? serverCacheNode.getNode() : ChildrenNode.EMPTY_NODE, serverCacheComplete);
    return viewGetCompleteNode(view);
}
/**
 * A helper method that visits all descendant and ancestor SyncPoints, applying the operation.
 *
 * NOTES:
 * - Descendant SyncPoints will be visited first (since we raise events depth-first).
 *
 * - We call applyOperation() on each SyncPoint passing three things:
 *   1. A version of the Operation that has been made relative to the SyncPoint location.
 *   2. A WriteTreeRef of any writes we have cached at the SyncPoint location.
 *   3. A snapshot Node with cached server data, if we have it.
 *
 * - We concatenate all of the events returned by each SyncPoint and return the result.
 */
function syncTreeApplyOperationToSyncPoints_(syncTree, operation) {
    return syncTreeApplyOperationHelper_(operation, syncTree.syncPointTree_, 
    /*serverCache=*/ null, writeTreeChildWrites(syncTree.pendingWriteTree_, newEmptyPath()));
}
/**
 * Recursive helper for applyOperationToSyncPoints_
 */
function syncTreeApplyOperationHelper_(operation, syncPointTree, serverCache, writesCache) {
    if (pathIsEmpty(operation.path)) {
        return syncTreeApplyOperationDescendantsHelper_(operation, syncPointTree, serverCache, writesCache);
    }
    else {
        var syncPoint = syncPointTree.get(newEmptyPath());
        // If we don't have cached server data, see if we can get it from this SyncPoint.
        if (serverCache == null && syncPoint != null) {
            serverCache = syncPointGetCompleteServerCache(syncPoint, newEmptyPath());
        }
        var events = [];
        var childName = pathGetFront(operation.path);
        var childOperation = operation.operationForChild(childName);
        var childTree = syncPointTree.children.get(childName);
        if (childTree && childOperation) {
            var childServerCache = serverCache
                ? serverCache.getImmediateChild(childName)
                : null;
            var childWritesCache = writeTreeRefChild(writesCache, childName);
            events = events.concat(syncTreeApplyOperationHelper_(childOperation, childTree, childServerCache, childWritesCache));
        }
        if (syncPoint) {
            events = events.concat(syncPointApplyOperation(syncPoint, operation, writesCache, serverCache));
        }
        return events;
    }
}
/**
 * Recursive helper for applyOperationToSyncPoints_
 */
function syncTreeApplyOperationDescendantsHelper_(operation, syncPointTree, serverCache, writesCache) {
    var syncPoint = syncPointTree.get(newEmptyPath());
    // If we don't have cached server data, see if we can get it from this SyncPoint.
    if (serverCache == null && syncPoint != null) {
        serverCache = syncPointGetCompleteServerCache(syncPoint, newEmptyPath());
    }
    var events = [];
    syncPointTree.children.inorderTraversal(function (childName, childTree) {
        var childServerCache = serverCache
            ? serverCache.getImmediateChild(childName)
            : null;
        var childWritesCache = writeTreeRefChild(writesCache, childName);
        var childOperation = operation.operationForChild(childName);
        if (childOperation) {
            events = events.concat(syncTreeApplyOperationDescendantsHelper_(childOperation, childTree, childServerCache, childWritesCache));
        }
    });
    if (syncPoint) {
        events = events.concat(syncPointApplyOperation(syncPoint, operation, writesCache, serverCache));
    }
    return events;
}
function syncTreeCreateListenerForView_(syncTree, view) {
    var query = view.query;
    var tag = syncTreeTagForQuery_(syncTree, query);
    return {
        hashFn: function () {
            var cache = viewGetServerCache(view) || ChildrenNode.EMPTY_NODE;
            return cache.hash();
        },
        onComplete: function (status) {
            if (status === 'ok') {
                if (tag) {
                    return syncTreeApplyTaggedListenComplete(syncTree, query._path, tag);
                }
                else {
                    return syncTreeApplyListenComplete(syncTree, query._path);
                }
            }
            else {
                // If a listen failed, kill all of the listeners here, not just the one that triggered the error.
                // Note that this may need to be scoped to just this listener if we change permissions on filtered children
                var error = errorForServerCode(status, query);
                return syncTreeRemoveEventRegistration(syncTree, query, 
                /*eventRegistration*/ null, error);
            }
        }
    };
}
/**
 * Return the tag associated with the given query.
 */
function syncTreeTagForQuery_(syncTree, query) {
    var queryKey = syncTreeMakeQueryKey_(query);
    return syncTree.queryToTagMap.get(queryKey);
}
/**
 * Given a query, computes a "queryKey" suitable for use in our queryToTagMap_.
 */
function syncTreeMakeQueryKey_(query) {
    return query._path.toString() + '$' + query._queryIdentifier;
}
/**
 * Return the query associated with the given tag, if we have one
 */
function syncTreeQueryKeyForTag_(syncTree, tag) {
    return syncTree.tagToQueryMap.get(tag);
}
/**
 * Given a queryKey (created by makeQueryKey), parse it back into a path and queryId.
 */
function syncTreeParseQueryKey_(queryKey) {
    var splitIndex = queryKey.indexOf('$');
    util.assert(splitIndex !== -1 && splitIndex < queryKey.length - 1, 'Bad queryKey.');
    return {
        queryId: queryKey.substr(splitIndex + 1),
        path: new Path(queryKey.substr(0, splitIndex))
    };
}
/**
 * A helper method to apply tagged operations
 */
function syncTreeApplyTaggedOperation_(syncTree, queryPath, operation) {
    var syncPoint = syncTree.syncPointTree_.get(queryPath);
    util.assert(syncPoint, "Missing sync point for query tag that we're tracking");
    var writesCache = writeTreeChildWrites(syncTree.pendingWriteTree_, queryPath);
    return syncPointApplyOperation(syncPoint, operation, writesCache, null);
}
/**
 * This collapses multiple unfiltered views into a single view, since we only need a single
 * listener for them.
 */
function syncTreeCollectDistinctViewsForSubTree_(subtree) {
    return subtree.fold(function (relativePath, maybeChildSyncPoint, childMap) {
        if (maybeChildSyncPoint && syncPointHasCompleteView(maybeChildSyncPoint)) {
            var completeView = syncPointGetCompleteView(maybeChildSyncPoint);
            return [completeView];
        }
        else {
            // No complete view here, flatten any deeper listens into an array
            var views_1 = [];
            if (maybeChildSyncPoint) {
                views_1 = syncPointGetQueryViews(maybeChildSyncPoint);
            }
            each(childMap, function (_key, childViews) {
                views_1 = views_1.concat(childViews);
            });
            return views_1;
        }
    });
}
/**
 * Normalizes a query to a query we send the server for listening
 *
 * @returns The normalized query
 */
function syncTreeQueryForListening_(query) {
    if (query._queryParams.loadsAllData() && !query._queryParams.isDefault()) {
        // We treat queries that load all data as default queries
        // Cast is necessary because ref() technically returns Firebase which is actually fb.api.Firebase which inherits
        // from Query
        return new (syncTreeGetReferenceConstructor())(query._repo, query._path);
    }
    else {
        return query;
    }
}
function syncTreeRemoveTags_(syncTree, queries) {
    for (var j = 0; j < queries.length; ++j) {
        var removedQuery = queries[j];
        if (!removedQuery._queryParams.loadsAllData()) {
            // We should have a tag for this
            var removedQueryKey = syncTreeMakeQueryKey_(removedQuery);
            var removedQueryTag = syncTree.queryToTagMap.get(removedQueryKey);
            syncTree.queryToTagMap.delete(removedQueryKey);
            syncTree.tagToQueryMap.delete(removedQueryTag);
        }
    }
}
/**
 * Static accessor for query tags.
 */
function syncTreeGetNextQueryTag_() {
    return syncTreeNextQueryTag_++;
}
/**
 * For a given new listen, manage the de-duplication of outstanding subscriptions.
 *
 * @returns This method can return events to support synchronous data sources
 */
function syncTreeSetupListener_(syncTree, query, view) {
    var path = query._path;
    var tag = syncTreeTagForQuery_(syncTree, query);
    var listener = syncTreeCreateListenerForView_(syncTree, view);
    var events = syncTree.listenProvider_.startListening(syncTreeQueryForListening_(query), tag, listener.hashFn, listener.onComplete);
    var subtree = syncTree.syncPointTree_.subtree(path);
    // The root of this subtree has our query. We're here because we definitely need to send a listen for that, but we
    // may need to shadow other listens as well.
    if (tag) {
        util.assert(!syncPointHasCompleteView(subtree.value), "If we're adding a query, it shouldn't be shadowed");
    }
    else {
        // Shadow everything at or below this location, this is a default listener.
        var queriesToStop = subtree.fold(function (relativePath, maybeChildSyncPoint, childMap) {
            if (!pathIsEmpty(relativePath) &&
                maybeChildSyncPoint &&
                syncPointHasCompleteView(maybeChildSyncPoint)) {
                return [syncPointGetCompleteView(maybeChildSyncPoint).query];
            }
            else {
                // No default listener here, flatten any deeper queries into an array
                var queries_1 = [];
                if (maybeChildSyncPoint) {
                    queries_1 = queries_1.concat(syncPointGetQueryViews(maybeChildSyncPoint).map(function (view) { return view.query; }));
                }
                each(childMap, function (_key, childQueries) {
                    queries_1 = queries_1.concat(childQueries);
                });
                return queries_1;
            }
        });
        for (var i = 0; i < queriesToStop.length; ++i) {
            var queryToStop = queriesToStop[i];
            syncTree.listenProvider_.stopListening(syncTreeQueryForListening_(queryToStop), syncTreeTagForQuery_(syncTree, queryToStop));
        }
    }
    return events;
}

/**
 * @license
 * Copyright 2017 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
var INTERRUPT_REASON = 'repo_interrupt';
/**
 * If a transaction does not succeed after 25 retries, we abort it. Among other
 * things this ensure that if there's ever a bug causing a mismatch between
 * client / server hashes for some data, we won't retry indefinitely.
 */
var MAX_TRANSACTION_RETRIES = 25;
/**
 * A connection to a single data repository.
 */
var Repo = /** @class */ (function () {
    function Repo(repoInfo_, forceRestClient_, authTokenProvider_, appCheckProvider_) {
        this.repoInfo_ = repoInfo_;
        this.forceRestClient_ = forceRestClient_;
        this.authTokenProvider_ = authTokenProvider_;
        this.appCheckProvider_ = appCheckProvider_;
        this.dataUpdateCount = 0;
        this.statsListener_ = null;
        this.eventQueue_ = new EventQueue();
        this.nextWriteId_ = 1;
        this.interceptServerDataCallback_ = null;
        /** A list of data pieces and paths to be set when this client disconnects. */
        this.onDisconnect_ = newSparseSnapshotTree();
        /** Stores queues of outstanding transactions for Firebase locations. */
        this.transactionQueueTree_ = new Tree();
        // TODO: This should be @private but it's used by test_access.js and internal.js
        this.persistentConnection_ = null;
        // This key is intentionally not updated if RepoInfo is later changed or replaced
        this.key = this.repoInfo_.toURLString();
    }
    /**
     * @returns The URL corresponding to the root of this Firebase.
     */
    Repo.prototype.toString = function () {
        return ((this.repoInfo_.secure ? 'https://' : 'http://') + this.repoInfo_.host);
    };
    return Repo;
}());
function repoStart(repo, appId, authOverride) {
    repo.stats_ = statsManagerGetCollection(repo.repoInfo_);
    if (repo.forceRestClient_ || beingCrawled()) {
        repo.server_ = new ReadonlyRestClient(repo.repoInfo_, function (pathString, data, isMerge, tag) {
            repoOnDataUpdate(repo, pathString, data, isMerge, tag);
        }, repo.authTokenProvider_, repo.appCheckProvider_);
        // Minor hack: Fire onConnect immediately, since there's no actual connection.
        setTimeout(function () { return repoOnConnectStatus(repo, /* connectStatus= */ true); }, 0);
    }
    else {
        // Validate authOverride
        if (typeof authOverride !== 'undefined' && authOverride !== null) {
            if (typeof authOverride !== 'object') {
                throw new Error('Only objects are supported for option databaseAuthVariableOverride');
            }
            try {
                util.stringify(authOverride);
            }
            catch (e) {
                throw new Error('Invalid authOverride provided: ' + e);
            }
        }
        repo.persistentConnection_ = new PersistentConnection(repo.repoInfo_, appId, function (pathString, data, isMerge, tag) {
            repoOnDataUpdate(repo, pathString, data, isMerge, tag);
        }, function (connectStatus) {
            repoOnConnectStatus(repo, connectStatus);
        }, function (updates) {
            repoOnServerInfoUpdate(repo, updates);
        }, repo.authTokenProvider_, repo.appCheckProvider_, authOverride);
        repo.server_ = repo.persistentConnection_;
    }
    repo.authTokenProvider_.addTokenChangeListener(function (token) {
        repo.server_.refreshAuthToken(token);
    });
    repo.appCheckProvider_.addTokenChangeListener(function (result) {
        repo.server_.refreshAppCheckToken(result.token);
    });
    // In the case of multiple Repos for the same repoInfo (i.e. there are multiple Firebase.Contexts being used),
    // we only want to create one StatsReporter.  As such, we'll report stats over the first Repo created.
    repo.statsReporter_ = statsManagerGetOrCreateReporter(repo.repoInfo_, function () { return new StatsReporter(repo.stats_, repo.server_); });
    // Used for .info.
    repo.infoData_ = new SnapshotHolder();
    repo.infoSyncTree_ = new SyncTree({
        startListening: function (query, tag, currentHashFn, onComplete) {
            var infoEvents = [];
            var node = repo.infoData_.getNode(query._path);
            // This is possibly a hack, but we have different semantics for .info endpoints. We don't raise null events
            // on initial data...
            if (!node.isEmpty()) {
                infoEvents = syncTreeApplyServerOverwrite(repo.infoSyncTree_, query._path, node);
                setTimeout(function () {
                    onComplete('ok');
                }, 0);
            }
            return infoEvents;
        },
        stopListening: function () { }
    });
    repoUpdateInfo(repo, 'connected', false);
    repo.serverSyncTree_ = new SyncTree({
        startListening: function (query, tag, currentHashFn, onComplete) {
            repo.server_.listen(query, currentHashFn, tag, function (status, data) {
                var events = onComplete(status, data);
                eventQueueRaiseEventsForChangedPath(repo.eventQueue_, query._path, events);
            });
            // No synchronous events for network-backed sync trees
            return [];
        },
        stopListening: function (query, tag) {
            repo.server_.unlisten(query, tag);
        }
    });
}
/**
 * @returns The time in milliseconds, taking the server offset into account if we have one.
 */
function repoServerTime(repo) {
    var offsetNode = repo.infoData_.getNode(new Path('.info/serverTimeOffset'));
    var offset = offsetNode.val() || 0;
    return new Date().getTime() + offset;
}
/**
 * Generate ServerValues using some variables from the repo object.
 */
function repoGenerateServerValues(repo) {
    return generateWithValues({
        timestamp: repoServerTime(repo)
    });
}
/**
 * Called by realtime when we get new messages from the server.
 */
function repoOnDataUpdate(repo, pathString, data, isMerge, tag) {
    // For testing.
    repo.dataUpdateCount++;
    var path = new Path(pathString);
    data = repo.interceptServerDataCallback_
        ? repo.interceptServerDataCallback_(pathString, data)
        : data;
    var events = [];
    if (tag) {
        if (isMerge) {
            var taggedChildren = util.map(data, function (raw) { return nodeFromJSON(raw); });
            events = syncTreeApplyTaggedQueryMerge(repo.serverSyncTree_, path, taggedChildren, tag);
        }
        else {
            var taggedSnap = nodeFromJSON(data);
            events = syncTreeApplyTaggedQueryOverwrite(repo.serverSyncTree_, path, taggedSnap, tag);
        }
    }
    else if (isMerge) {
        var changedChildren = util.map(data, function (raw) { return nodeFromJSON(raw); });
        events = syncTreeApplyServerMerge(repo.serverSyncTree_, path, changedChildren);
    }
    else {
        var snap = nodeFromJSON(data);
        events = syncTreeApplyServerOverwrite(repo.serverSyncTree_, path, snap);
    }
    var affectedPath = path;
    if (events.length > 0) {
        // Since we have a listener outstanding for each transaction, receiving any events
        // is a proxy for some change having occurred.
        affectedPath = repoRerunTransactions(repo, path);
    }
    eventQueueRaiseEventsForChangedPath(repo.eventQueue_, affectedPath, events);
}
function repoOnConnectStatus(repo, connectStatus) {
    repoUpdateInfo(repo, 'connected', connectStatus);
    if (connectStatus === false) {
        repoRunOnDisconnectEvents(repo);
    }
}
function repoOnServerInfoUpdate(repo, updates) {
    each(updates, function (key, value) {
        repoUpdateInfo(repo, key, value);
    });
}
function repoUpdateInfo(repo, pathString, value) {
    var path = new Path('/.info/' + pathString);
    var newNode = nodeFromJSON(value);
    repo.infoData_.updateSnapshot(path, newNode);
    var events = syncTreeApplyServerOverwrite(repo.infoSyncTree_, path, newNode);
    eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, events);
}
function repoGetNextWriteId(repo) {
    return repo.nextWriteId_++;
}
/**
 * The purpose of `getValue` is to return the latest known value
 * satisfying `query`.
 *
 * This method will first check for in-memory cached values
 * belonging to active listeners. If they are found, such values
 * are considered to be the most up-to-date.
 *
 * If the client is not connected, this method will try to
 * establish a connection and request the value for `query`. If
 * the client is not able to retrieve the query result, it reports
 * an error.
 *
 * @param query - The query to surface a value for.
 */
function repoGetValue(repo, query) {
    // Only active queries are cached. There is no persisted cache.
    var cached = syncTreeGetServerValue(repo.serverSyncTree_, query);
    if (cached != null) {
        return Promise.resolve(cached);
    }
    return repo.server_.get(query).then(function (payload) {
        var node = nodeFromJSON(payload).withIndex(query._queryParams.getIndex());
        // if this is a filtered query, then overwrite at path
        if (query._queryParams.loadsAllData()) {
            syncTreeApplyServerOverwrite(repo.serverSyncTree_, query._path, node);
        }
        else {
            // Simulate `syncTreeAddEventRegistration` without events/listener setup.
            // We do this (along with the syncTreeRemoveEventRegistration` below) so that
            // `repoGetValue` results have the same cache effects as initial listener(s)
            // updates.
            var tag = syncTreeRegisterQuery(repo.serverSyncTree_, query);
            syncTreeApplyTaggedQueryOverwrite(repo.serverSyncTree_, query._path, node, tag);
            // Call `syncTreeRemoveEventRegistration` with a null event registration, since there is none.
            // Note: The below code essentially unregisters the query and cleans up any views/syncpoints temporarily created above.
        }
        var cancels = syncTreeRemoveEventRegistration(repo.serverSyncTree_, query, null);
        if (cancels.length > 0) {
            repoLog(repo, 'unexpected cancel events in repoGetValue');
        }
        return node;
    }, function (err) {
        repoLog(repo, 'get for query ' + util.stringify(query) + ' failed: ' + err);
        return Promise.reject(new Error(err));
    });
}
function repoSetWithPriority(repo, path, newVal, newPriority, onComplete) {
    repoLog(repo, 'set', {
        path: path.toString(),
        value: newVal,
        priority: newPriority
    });
    // TODO: Optimize this behavior to either (a) store flag to skip resolving where possible and / or
    // (b) store unresolved paths on JSON parse
    var serverValues = repoGenerateServerValues(repo);
    var newNodeUnresolved = nodeFromJSON(newVal, newPriority);
    var existing = syncTreeCalcCompleteEventCache(repo.serverSyncTree_, path);
    var newNode = resolveDeferredValueSnapshot(newNodeUnresolved, existing, serverValues);
    var writeId = repoGetNextWriteId(repo);
    var events = syncTreeApplyUserOverwrite(repo.serverSyncTree_, path, newNode, writeId, true);
    eventQueueQueueEvents(repo.eventQueue_, events);
    repo.server_.put(path.toString(), newNodeUnresolved.val(/*export=*/ true), function (status, errorReason) {
        var success = status === 'ok';
        if (!success) {
            warn$1('set at ' + path + ' failed: ' + status);
        }
        var clearEvents = syncTreeAckUserWrite(repo.serverSyncTree_, writeId, !success);
        eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, clearEvents);
        repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
    });
    var affectedPath = repoAbortTransactions(repo, path);
    repoRerunTransactions(repo, affectedPath);
    // We queued the events above, so just flush the queue here
    eventQueueRaiseEventsForChangedPath(repo.eventQueue_, affectedPath, []);
}
function repoUpdate(repo, path, childrenToMerge, onComplete) {
    repoLog(repo, 'update', { path: path.toString(), value: childrenToMerge });
    // Start with our existing data and merge each child into it.
    var empty = true;
    var serverValues = repoGenerateServerValues(repo);
    var changedChildren = {};
    each(childrenToMerge, function (changedKey, changedValue) {
        empty = false;
        changedChildren[changedKey] = resolveDeferredValueTree(pathChild(path, changedKey), nodeFromJSON(changedValue), repo.serverSyncTree_, serverValues);
    });
    if (!empty) {
        var writeId_1 = repoGetNextWriteId(repo);
        var events = syncTreeApplyUserMerge(repo.serverSyncTree_, path, changedChildren, writeId_1);
        eventQueueQueueEvents(repo.eventQueue_, events);
        repo.server_.merge(path.toString(), childrenToMerge, function (status, errorReason) {
            var success = status === 'ok';
            if (!success) {
                warn$1('update at ' + path + ' failed: ' + status);
            }
            var clearEvents = syncTreeAckUserWrite(repo.serverSyncTree_, writeId_1, !success);
            var affectedPath = clearEvents.length > 0 ? repoRerunTransactions(repo, path) : path;
            eventQueueRaiseEventsForChangedPath(repo.eventQueue_, affectedPath, clearEvents);
            repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
        });
        each(childrenToMerge, function (changedPath) {
            var affectedPath = repoAbortTransactions(repo, pathChild(path, changedPath));
            repoRerunTransactions(repo, affectedPath);
        });
        // We queued the events above, so just flush the queue here
        eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, []);
    }
    else {
        log("update() called with empty data.  Don't do anything.");
        repoCallOnCompleteCallback(repo, onComplete, 'ok', undefined);
    }
}
/**
 * Applies all of the changes stored up in the onDisconnect_ tree.
 */
function repoRunOnDisconnectEvents(repo) {
    repoLog(repo, 'onDisconnectEvents');
    var serverValues = repoGenerateServerValues(repo);
    var resolvedOnDisconnectTree = newSparseSnapshotTree();
    sparseSnapshotTreeForEachTree(repo.onDisconnect_, newEmptyPath(), function (path, node) {
        var resolved = resolveDeferredValueTree(path, node, repo.serverSyncTree_, serverValues);
        sparseSnapshotTreeRemember(resolvedOnDisconnectTree, path, resolved);
    });
    var events = [];
    sparseSnapshotTreeForEachTree(resolvedOnDisconnectTree, newEmptyPath(), function (path, snap) {
        events = events.concat(syncTreeApplyServerOverwrite(repo.serverSyncTree_, path, snap));
        var affectedPath = repoAbortTransactions(repo, path);
        repoRerunTransactions(repo, affectedPath);
    });
    repo.onDisconnect_ = newSparseSnapshotTree();
    eventQueueRaiseEventsForChangedPath(repo.eventQueue_, newEmptyPath(), events);
}
function repoOnDisconnectCancel(repo, path, onComplete) {
    repo.server_.onDisconnectCancel(path.toString(), function (status, errorReason) {
        if (status === 'ok') {
            sparseSnapshotTreeForget(repo.onDisconnect_, path);
        }
        repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
    });
}
function repoOnDisconnectSet(repo, path, value, onComplete) {
    var newNode = nodeFromJSON(value);
    repo.server_.onDisconnectPut(path.toString(), newNode.val(/*export=*/ true), function (status, errorReason) {
        if (status === 'ok') {
            sparseSnapshotTreeRemember(repo.onDisconnect_, path, newNode);
        }
        repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
    });
}
function repoOnDisconnectSetWithPriority(repo, path, value, priority, onComplete) {
    var newNode = nodeFromJSON(value, priority);
    repo.server_.onDisconnectPut(path.toString(), newNode.val(/*export=*/ true), function (status, errorReason) {
        if (status === 'ok') {
            sparseSnapshotTreeRemember(repo.onDisconnect_, path, newNode);
        }
        repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
    });
}
function repoOnDisconnectUpdate(repo, path, childrenToMerge, onComplete) {
    if (util.isEmpty(childrenToMerge)) {
        log("onDisconnect().update() called with empty data.  Don't do anything.");
        repoCallOnCompleteCallback(repo, onComplete, 'ok', undefined);
        return;
    }
    repo.server_.onDisconnectMerge(path.toString(), childrenToMerge, function (status, errorReason) {
        if (status === 'ok') {
            each(childrenToMerge, function (childName, childNode) {
                var newChildNode = nodeFromJSON(childNode);
                sparseSnapshotTreeRemember(repo.onDisconnect_, pathChild(path, childName), newChildNode);
            });
        }
        repoCallOnCompleteCallback(repo, onComplete, status, errorReason);
    });
}
function repoAddEventCallbackForQuery(repo, query, eventRegistration) {
    var events;
    if (pathGetFront(query._path) === '.info') {
        events = syncTreeAddEventRegistration(repo.infoSyncTree_, query, eventRegistration);
    }
    else {
        events = syncTreeAddEventRegistration(repo.serverSyncTree_, query, eventRegistration);
    }
    eventQueueRaiseEventsAtPath(repo.eventQueue_, query._path, events);
}
function repoRemoveEventCallbackForQuery(repo, query, eventRegistration) {
    // These are guaranteed not to raise events, since we're not passing in a cancelError. However, we can future-proof
    // a little bit by handling the return values anyways.
    var events;
    if (pathGetFront(query._path) === '.info') {
        events = syncTreeRemoveEventRegistration(repo.infoSyncTree_, query, eventRegistration);
    }
    else {
        events = syncTreeRemoveEventRegistration(repo.serverSyncTree_, query, eventRegistration);
    }
    eventQueueRaiseEventsAtPath(repo.eventQueue_, query._path, events);
}
function repoInterrupt(repo) {
    if (repo.persistentConnection_) {
        repo.persistentConnection_.interrupt(INTERRUPT_REASON);
    }
}
function repoResume(repo) {
    if (repo.persistentConnection_) {
        repo.persistentConnection_.resume(INTERRUPT_REASON);
    }
}
function repoLog(repo) {
    var varArgs = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        varArgs[_i - 1] = arguments[_i];
    }
    var prefix = '';
    if (repo.persistentConnection_) {
        prefix = repo.persistentConnection_.id + ':';
    }
    log.apply(void 0, tslib.__spreadArray([prefix], tslib.__read(varArgs)));
}
function repoCallOnCompleteCallback(repo, callback, status, errorReason) {
    if (callback) {
        exceptionGuard(function () {
            if (status === 'ok') {
                callback(null);
            }
            else {
                var code = (status || 'error').toUpperCase();
                var message = code;
                if (errorReason) {
                    message += ': ' + errorReason;
                }
                var error = new Error(message);
                // eslint-disable-next-line @typescript-eslint/no-explicit-any
                error.code = code;
                callback(error);
            }
        });
    }
}
/**
 * Creates a new transaction, adds it to the transactions we're tracking, and
 * sends it to the server if possible.
 *
 * @param path - Path at which to do transaction.
 * @param transactionUpdate - Update callback.
 * @param onComplete - Completion callback.
 * @param unwatcher - Function that will be called when the transaction no longer
 * need data updates for `path`.
 * @param applyLocally - Whether or not to make intermediate results visible
 */
function repoStartTransaction(repo, path, transactionUpdate, onComplete, unwatcher, applyLocally) {
    repoLog(repo, 'transaction on ' + path);
    // Initialize transaction.
    var transaction = {
        path: path,
        update: transactionUpdate,
        onComplete: onComplete,
        // One of TransactionStatus enums.
        status: null,
        // Used when combining transactions at different locations to figure out
        // which one goes first.
        order: LUIDGenerator(),
        // Whether to raise local events for this transaction.
        applyLocally: applyLocally,
        // Count of how many times we've retried the transaction.
        retryCount: 0,
        // Function to call to clean up our .on() listener.
        unwatcher: unwatcher,
        // Stores why a transaction was aborted.
        abortReason: null,
        currentWriteId: null,
        currentInputSnapshot: null,
        currentOutputSnapshotRaw: null,
        currentOutputSnapshotResolved: null
    };
    // Run transaction initially.
    var currentState = repoGetLatestState(repo, path, undefined);
    transaction.currentInputSnapshot = currentState;
    var newVal = transaction.update(currentState.val());
    if (newVal === undefined) {
        // Abort transaction.
        transaction.unwatcher();
        transaction.currentOutputSnapshotRaw = null;
        transaction.currentOutputSnapshotResolved = null;
        if (transaction.onComplete) {
            transaction.onComplete(null, false, transaction.currentInputSnapshot);
        }
    }
    else {
        validateFirebaseData('transaction failed: Data returned ', newVal, transaction.path);
        // Mark as run and add to our queue.
        transaction.status = 0 /* RUN */;
        var queueNode = treeSubTree(repo.transactionQueueTree_, path);
        var nodeQueue = treeGetValue(queueNode) || [];
        nodeQueue.push(transaction);
        treeSetValue(queueNode, nodeQueue);
        // Update visibleData and raise events
        // Note: We intentionally raise events after updating all of our
        // transaction state, since the user could start new transactions from the
        // event callbacks.
        var priorityForNode = void 0;
        if (typeof newVal === 'object' &&
            newVal !== null &&
            util.contains(newVal, '.priority')) {
            // eslint-disable-next-line @typescript-eslint/no-explicit-any
            priorityForNode = util.safeGet(newVal, '.priority');
            util.assert(isValidPriority(priorityForNode), 'Invalid priority returned by transaction. ' +
                'Priority must be a valid string, finite number, server value, or null.');
        }
        else {
            var currentNode = syncTreeCalcCompleteEventCache(repo.serverSyncTree_, path) ||
                ChildrenNode.EMPTY_NODE;
            priorityForNode = currentNode.getPriority().val();
        }
        var serverValues = repoGenerateServerValues(repo);
        var newNodeUnresolved = nodeFromJSON(newVal, priorityForNode);
        var newNode = resolveDeferredValueSnapshot(newNodeUnresolved, currentState, serverValues);
        transaction.currentOutputSnapshotRaw = newNodeUnresolved;
        transaction.currentOutputSnapshotResolved = newNode;
        transaction.currentWriteId = repoGetNextWriteId(repo);
        var events = syncTreeApplyUserOverwrite(repo.serverSyncTree_, path, newNode, transaction.currentWriteId, transaction.applyLocally);
        eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, events);
        repoSendReadyTransactions(repo, repo.transactionQueueTree_);
    }
}
/**
 * @param excludeSets - A specific set to exclude
 */
function repoGetLatestState(repo, path, excludeSets) {
    return (syncTreeCalcCompleteEventCache(repo.serverSyncTree_, path, excludeSets) ||
        ChildrenNode.EMPTY_NODE);
}
/**
 * Sends any already-run transactions that aren't waiting for outstanding
 * transactions to complete.
 *
 * Externally it's called with no arguments, but it calls itself recursively
 * with a particular transactionQueueTree node to recurse through the tree.
 *
 * @param node - transactionQueueTree node to start at.
 */
function repoSendReadyTransactions(repo, node) {
    if (node === void 0) { node = repo.transactionQueueTree_; }
    // Before recursing, make sure any completed transactions are removed.
    if (!node) {
        repoPruneCompletedTransactionsBelowNode(repo, node);
    }
    if (treeGetValue(node)) {
        var queue = repoBuildTransactionQueue(repo, node);
        util.assert(queue.length > 0, 'Sending zero length transaction queue');
        var allRun = queue.every(function (transaction) { return transaction.status === 0 /* RUN */; });
        // If they're all run (and not sent), we can send them.  Else, we must wait.
        if (allRun) {
            repoSendTransactionQueue(repo, treeGetPath(node), queue);
        }
    }
    else if (treeHasChildren(node)) {
        treeForEachChild(node, function (childNode) {
            repoSendReadyTransactions(repo, childNode);
        });
    }
}
/**
 * Given a list of run transactions, send them to the server and then handle
 * the result (success or failure).
 *
 * @param path - The location of the queue.
 * @param queue - Queue of transactions under the specified location.
 */
function repoSendTransactionQueue(repo, path, queue) {
    // Mark transactions as sent and increment retry count!
    var setsToIgnore = queue.map(function (txn) {
        return txn.currentWriteId;
    });
    var latestState = repoGetLatestState(repo, path, setsToIgnore);
    var snapToSend = latestState;
    var latestHash = latestState.hash();
    for (var i = 0; i < queue.length; i++) {
        var txn = queue[i];
        util.assert(txn.status === 0 /* RUN */, 'tryToSendTransactionQueue_: items in queue should all be run.');
        txn.status = 1 /* SENT */;
        txn.retryCount++;
        var relativePath = newRelativePath(path, txn.path);
        // If we've gotten to this point, the output snapshot must be defined.
        snapToSend = snapToSend.updateChild(relativePath /** @type {!Node} */, txn.currentOutputSnapshotRaw);
    }
    var dataToSend = snapToSend.val(true);
    var pathToSend = path;
    // Send the put.
    repo.server_.put(pathToSend.toString(), dataToSend, function (status) {
        repoLog(repo, 'transaction put response', {
            path: pathToSend.toString(),
            status: status
        });
        var events = [];
        if (status === 'ok') {
            // Queue up the callbacks and fire them after cleaning up all of our
            // transaction state, since the callback could trigger more
            // transactions or sets.
            var callbacks = [];
            var _loop_1 = function (i) {
                queue[i].status = 2 /* COMPLETED */;
                events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, queue[i].currentWriteId));
                if (queue[i].onComplete) {
                    // We never unset the output snapshot, and given that this
                    // transaction is complete, it should be set
                    callbacks.push(function () {
                        return queue[i].onComplete(null, true, queue[i].currentOutputSnapshotResolved);
                    });
                }
                queue[i].unwatcher();
            };
            for (var i = 0; i < queue.length; i++) {
                _loop_1(i);
            }
            // Now remove the completed transactions.
            repoPruneCompletedTransactionsBelowNode(repo, treeSubTree(repo.transactionQueueTree_, path));
            // There may be pending transactions that we can now send.
            repoSendReadyTransactions(repo, repo.transactionQueueTree_);
            eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, events);
            // Finally, trigger onComplete callbacks.
            for (var i = 0; i < callbacks.length; i++) {
                exceptionGuard(callbacks[i]);
            }
        }
        else {
            // transactions are no longer sent.  Update their status appropriately.
            if (status === 'datastale') {
                for (var i = 0; i < queue.length; i++) {
                    if (queue[i].status === 3 /* SENT_NEEDS_ABORT */) {
                        queue[i].status = 4 /* NEEDS_ABORT */;
                    }
                    else {
                        queue[i].status = 0 /* RUN */;
                    }
                }
            }
            else {
                warn$1('transaction at ' + pathToSend.toString() + ' failed: ' + status);
                for (var i = 0; i < queue.length; i++) {
                    queue[i].status = 4 /* NEEDS_ABORT */;
                    queue[i].abortReason = status;
                }
            }
            repoRerunTransactions(repo, path);
        }
    }, latestHash);
}
/**
 * Finds all transactions dependent on the data at changedPath and reruns them.
 *
 * Should be called any time cached data changes.
 *
 * Return the highest path that was affected by rerunning transactions. This
 * is the path at which events need to be raised for.
 *
 * @param changedPath - The path in mergedData that changed.
 * @returns The rootmost path that was affected by rerunning transactions.
 */
function repoRerunTransactions(repo, changedPath) {
    var rootMostTransactionNode = repoGetAncestorTransactionNode(repo, changedPath);
    var path = treeGetPath(rootMostTransactionNode);
    var queue = repoBuildTransactionQueue(repo, rootMostTransactionNode);
    repoRerunTransactionQueue(repo, queue, path);
    return path;
}
/**
 * Does all the work of rerunning transactions (as well as cleans up aborted
 * transactions and whatnot).
 *
 * @param queue - The queue of transactions to run.
 * @param path - The path the queue is for.
 */
function repoRerunTransactionQueue(repo, queue, path) {
    if (queue.length === 0) {
        return; // Nothing to do!
    }
    // Queue up the callbacks and fire them after cleaning up all of our
    // transaction state, since the callback could trigger more transactions or
    // sets.
    var callbacks = [];
    var events = [];
    // Ignore all of the sets we're going to re-run.
    var txnsToRerun = queue.filter(function (q) {
        return q.status === 0 /* RUN */;
    });
    var setsToIgnore = txnsToRerun.map(function (q) {
        return q.currentWriteId;
    });
    var _loop_2 = function (i) {
        var transaction = queue[i];
        var relativePath = newRelativePath(path, transaction.path);
        var abortTransaction = false, abortReason;
        util.assert(relativePath !== null, 'rerunTransactionsUnderNode_: relativePath should not be null.');
        if (transaction.status === 4 /* NEEDS_ABORT */) {
            abortTransaction = true;
            abortReason = transaction.abortReason;
            events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, transaction.currentWriteId, true));
        }
        else if (transaction.status === 0 /* RUN */) {
            if (transaction.retryCount >= MAX_TRANSACTION_RETRIES) {
                abortTransaction = true;
                abortReason = 'maxretry';
                events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, transaction.currentWriteId, true));
            }
            else {
                // This code reruns a transaction
                var currentNode = repoGetLatestState(repo, transaction.path, setsToIgnore);
                transaction.currentInputSnapshot = currentNode;
                var newData = queue[i].update(currentNode.val());
                if (newData !== undefined) {
                    validateFirebaseData('transaction failed: Data returned ', newData, transaction.path);
                    var newDataNode = nodeFromJSON(newData);
                    var hasExplicitPriority = typeof newData === 'object' &&
                        newData != null &&
                        util.contains(newData, '.priority');
                    if (!hasExplicitPriority) {
                        // Keep the old priority if there wasn't a priority explicitly specified.
                        newDataNode = newDataNode.updatePriority(currentNode.getPriority());
                    }
                    var oldWriteId = transaction.currentWriteId;
                    var serverValues = repoGenerateServerValues(repo);
                    var newNodeResolved = resolveDeferredValueSnapshot(newDataNode, currentNode, serverValues);
                    transaction.currentOutputSnapshotRaw = newDataNode;
                    transaction.currentOutputSnapshotResolved = newNodeResolved;
                    transaction.currentWriteId = repoGetNextWriteId(repo);
                    // Mutates setsToIgnore in place
                    setsToIgnore.splice(setsToIgnore.indexOf(oldWriteId), 1);
                    events = events.concat(syncTreeApplyUserOverwrite(repo.serverSyncTree_, transaction.path, newNodeResolved, transaction.currentWriteId, transaction.applyLocally));
                    events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, oldWriteId, true));
                }
                else {
                    abortTransaction = true;
                    abortReason = 'nodata';
                    events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, transaction.currentWriteId, true));
                }
            }
        }
        eventQueueRaiseEventsForChangedPath(repo.eventQueue_, path, events);
        events = [];
        if (abortTransaction) {
            // Abort.
            queue[i].status = 2 /* COMPLETED */;
            // Removing a listener can trigger pruning which can muck with
            // mergedData/visibleData (as it prunes data). So defer the unwatcher
            // until we're done.
            (function (unwatcher) {
                setTimeout(unwatcher, Math.floor(0));
            })(queue[i].unwatcher);
            if (queue[i].onComplete) {
                if (abortReason === 'nodata') {
                    callbacks.push(function () {
                        return queue[i].onComplete(null, false, queue[i].currentInputSnapshot);
                    });
                }
                else {
                    callbacks.push(function () {
                        return queue[i].onComplete(new Error(abortReason), false, null);
                    });
                }
            }
        }
    };
    for (var i = 0; i < queue.length; i++) {
        _loop_2(i);
    }
    // Clean up completed transactions.
    repoPruneCompletedTransactionsBelowNode(repo, repo.transactionQueueTree_);
    // Now fire callbacks, now that we're in a good, known state.
    for (var i = 0; i < callbacks.length; i++) {
        exceptionGuard(callbacks[i]);
    }
    // Try to send the transaction result to the server.
    repoSendReadyTransactions(repo, repo.transactionQueueTree_);
}
/**
 * Returns the rootmost ancestor node of the specified path that has a pending
 * transaction on it, or just returns the node for the given path if there are
 * no pending transactions on any ancestor.
 *
 * @param path - The location to start at.
 * @returns The rootmost node with a transaction.
 */
function repoGetAncestorTransactionNode(repo, path) {
    var front;
    // Start at the root and walk deeper into the tree towards path until we
    // find a node with pending transactions.
    var transactionNode = repo.transactionQueueTree_;
    front = pathGetFront(path);
    while (front !== null && treeGetValue(transactionNode) === undefined) {
        transactionNode = treeSubTree(transactionNode, front);
        path = pathPopFront(path);
        front = pathGetFront(path);
    }
    return transactionNode;
}
/**
 * Builds the queue of all transactions at or below the specified
 * transactionNode.
 *
 * @param transactionNode
 * @returns The generated queue.
 */
function repoBuildTransactionQueue(repo, transactionNode) {
    // Walk any child transaction queues and aggregate them into a single queue.
    var transactionQueue = [];
    repoAggregateTransactionQueuesForNode(repo, transactionNode, transactionQueue);
    // Sort them by the order the transactions were created.
    transactionQueue.sort(function (a, b) { return a.order - b.order; });
    return transactionQueue;
}
function repoAggregateTransactionQueuesForNode(repo, node, queue) {
    var nodeQueue = treeGetValue(node);
    if (nodeQueue) {
        for (var i = 0; i < nodeQueue.length; i++) {
            queue.push(nodeQueue[i]);
        }
    }
    treeForEachChild(node, function (child) {
        repoAggregateTransactionQueuesForNode(repo, child, queue);
    });
}
/**
 * Remove COMPLETED transactions at or below this node in the transactionQueueTree_.
 */
function repoPruneCompletedTransactionsBelowNode(repo, node) {
    var queue = treeGetValue(node);
    if (queue) {
        var to = 0;
        for (var from = 0; from < queue.length; from++) {
            if (queue[from].status !== 2 /* COMPLETED */) {
                queue[to] = queue[from];
                to++;
            }
        }
        queue.length = to;
        treeSetValue(node, queue.length > 0 ? queue : undefined);
    }
    treeForEachChild(node, function (childNode) {
        repoPruneCompletedTransactionsBelowNode(repo, childNode);
    });
}
/**
 * Aborts all transactions on ancestors or descendants of the specified path.
 * Called when doing a set() or update() since we consider them incompatible
 * with transactions.
 *
 * @param path - Path for which we want to abort related transactions.
 */
function repoAbortTransactions(repo, path) {
    var affectedPath = treeGetPath(repoGetAncestorTransactionNode(repo, path));
    var transactionNode = treeSubTree(repo.transactionQueueTree_, path);
    treeForEachAncestor(transactionNode, function (node) {
        repoAbortTransactionsOnNode(repo, node);
    });
    repoAbortTransactionsOnNode(repo, transactionNode);
    treeForEachDescendant(transactionNode, function (node) {
        repoAbortTransactionsOnNode(repo, node);
    });
    return affectedPath;
}
/**
 * Abort transactions stored in this transaction queue node.
 *
 * @param node - Node to abort transactions for.
 */
function repoAbortTransactionsOnNode(repo, node) {
    var queue = treeGetValue(node);
    if (queue) {
        // Queue up the callbacks and fire them after cleaning up all of our
        // transaction state, since the callback could trigger more transactions
        // or sets.
        var callbacks = [];
        // Go through queue.  Any already-sent transactions must be marked for
        // abort, while the unsent ones can be immediately aborted and removed.
        var events = [];
        var lastSent = -1;
        for (var i = 0; i < queue.length; i++) {
            if (queue[i].status === 3 /* SENT_NEEDS_ABORT */) ;
            else if (queue[i].status === 1 /* SENT */) {
                util.assert(lastSent === i - 1, 'All SENT items should be at beginning of queue.');
                lastSent = i;
                // Mark transaction for abort when it comes back.
                queue[i].status = 3 /* SENT_NEEDS_ABORT */;
                queue[i].abortReason = 'set';
            }
            else {
                util.assert(queue[i].status === 0 /* RUN */, 'Unexpected transaction status in abort');
                // We can abort it immediately.
                queue[i].unwatcher();
                events = events.concat(syncTreeAckUserWrite(repo.serverSyncTree_, queue[i].currentWriteId, true));
                if (queue[i].onComplete) {
                    callbacks.push(queue[i].onComplete.bind(null, new Error('set'), false, null));
                }
            }
        }
        if (lastSent === -1) {
            // We're not waiting for any sent transactions.  We can clear the queue.
            treeSetValue(node, undefined);
        }
        else {
            // Remove the transactions we aborted.
            queue.length = lastSent + 1;
        }
        // Now fire the callbacks.
        eventQueueRaiseEventsForChangedPath(repo.eventQueue_, treeGetPath(node), events);
        for (var i = 0; i < callbacks.length; i++) {
            exceptionGuard(callbacks[i]);
        }
    }
}

/**
 * @license
 * Copyright 2021 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * The `onDisconnect` class allows you to write or clear data when your client
 * disconnects from the Database server. These updates occur whether your
 * client disconnects cleanly or not, so you can rely on them to clean up data
 * even if a connection is dropped or a client crashes.
 *
 * The `onDisconnect` class is most commonly used to manage presence in
 * applications where it is useful to detect how many clients are connected and
 * when other clients disconnect. See
 * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}
 * for more information.
 *
 * To avoid problems when a connection is dropped before the requests can be
 * transferred to the Database server, these functions should be called before
 * writing any data.
 *
 * Note that `onDisconnect` operations are only triggered once. If you want an
 * operation to occur each time a disconnect occurs, you'll need to re-establish
 * the `onDisconnect` operations each time you reconnect.
 */
var OnDisconnect$1 = /** @class */ (function () {
    /** @hideconstructor */
    function OnDisconnect(_repo, _path) {
        this._repo = _repo;
        this._path = _path;
    }
    /**
     * Cancels all previously queued `onDisconnect()` set or update events for this
     * location and all children.
     *
     * If a write has been queued for this location via a `set()` or `update()` at a
     * parent location, the write at this location will be canceled, though writes
     * to sibling locations will still occur.
     *
     * @returns Resolves when synchronization to the server is complete.
     */
    OnDisconnect.prototype.cancel = function () {
        var deferred = new util.Deferred();
        repoOnDisconnectCancel(this._repo, this._path, deferred.wrapCallback(function () { }));
        return deferred.promise;
    };
    /**
     * Ensures the data at this location is deleted when the client is disconnected
     * (due to closing the browser, navigating to a new page, or network issues).
     *
     * @returns Resolves when synchronization to the server is complete.
     */
    OnDisconnect.prototype.remove = function () {
        validateWritablePath('OnDisconnect.remove', this._path);
        var deferred = new util.Deferred();
        repoOnDisconnectSet(this._repo, this._path, null, deferred.wrapCallback(function () { }));
        return deferred.promise;
    };
    /**
     * Ensures the data at this location is set to the specified value when the
     * client is disconnected (due to closing the browser, navigating to a new page,
     * or network issues).
     *
     * `set()` is especially useful for implementing "presence" systems, where a
     * value should be changed or cleared when a user disconnects so that they
     * appear "offline" to other users. See
     * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}
     * for more information.
     *
     * Note that `onDisconnect` operations are only triggered once. If you want an
     * operation to occur each time a disconnect occurs, you'll need to re-establish
     * the `onDisconnect` operations each time.
     *
     * @param value - The value to be written to this location on disconnect (can
     * be an object, array, string, number, boolean, or null).
     * @returns Resolves when synchronization to the Database is complete.
     */
    OnDisconnect.prototype.set = function (value) {
        validateWritablePath('OnDisconnect.set', this._path);
        validateFirebaseDataArg('OnDisconnect.set', value, this._path, false);
        var deferred = new util.Deferred();
        repoOnDisconnectSet(this._repo, this._path, value, deferred.wrapCallback(function () { }));
        return deferred.promise;
    };
    /**
     * Ensures the data at this location is set to the specified value and priority
     * when the client is disconnected (due to closing the browser, navigating to a
     * new page, or network issues).
     *
     * @param value - The value to be written to this location on disconnect (can
     * be an object, array, string, number, boolean, or null).
     * @param priority - The priority to be written (string, number, or null).
     * @returns Resolves when synchronization to the Database is complete.
     */
    OnDisconnect.prototype.setWithPriority = function (value, priority) {
        validateWritablePath('OnDisconnect.setWithPriority', this._path);
        validateFirebaseDataArg('OnDisconnect.setWithPriority', value, this._path, false);
        validatePriority('OnDisconnect.setWithPriority', priority, false);
        var deferred = new util.Deferred();
        repoOnDisconnectSetWithPriority(this._repo, this._path, value, priority, deferred.wrapCallback(function () { }));
        return deferred.promise;
    };
    /**
     * Writes multiple values at this location when the client is disconnected (due
     * to closing the browser, navigating to a new page, or network issues).
     *
     * The `values` argument contains multiple property-value pairs that will be
     * written to the Database together. Each child property can either be a simple
     * property (for example, "name") or a relative path (for example, "name/first")
     * from the current location to the data to update.
     *
     * As opposed to the `set()` method, `update()` can be use to selectively update
     * only the referenced properties at the current location (instead of replacing
     * all the child properties at the current location).
     *
     * @param values - Object containing multiple values.
     * @returns Resolves when synchronization to the Database is complete.
     */
    OnDisconnect.prototype.update = function (values) {
        validateWritablePath('OnDisconnect.update', this._path);
        validateFirebaseMergeDataArg('OnDisconnect.update', values, this._path, false);
        var deferred = new util.Deferred();
        repoOnDisconnectUpdate(this._repo, this._path, values, deferred.wrapCallback(function () { }));
        return deferred.promise;
    };
    return OnDisconnect;
}());

/**
 * @license
 * Copyright 2020 Google LLC
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
/**
 * @internal
 */
var QueryImpl = /** @class */ (function () {
    /**
     * @hideconstructor
     */
    function QueryImpl(_repo, _path, _queryParams, _orderByCalled) {
        this._repo = _repo;
        this._path = _path;
        this._queryParams = _queryParams;
        this._orderByCalled = _orderByCalled;
    }
    Object.defineProperty(QueryImpl.prototype, "key", {
        get: function () {
            if (pathIsEmpty(this._path)) {
                return null;
            }
            else {
                return pathGetBack(this._path);
            }
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(QueryImpl.prototype, "ref", {
        get: function () {
            return new ReferenceImpl(this._repo, this._path);
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(QueryImpl.prototype, "_queryIdentifier", {
        get: function () {
            var obj = queryParamsGetQueryObject(this._queryParams);
            var id = ObjectToUniqueKey(obj);
            return id === '{}' ? 'default' : id;
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(QueryImpl.prototype, "_queryObject", {
        /**
         * An object representation of the query parameters used by this Query.
         */
        get: function () {
            return queryParamsGetQueryObject(this._queryParams);
        },
        enumerable: false,
        configurable: true
    });
    QueryImpl.prototype.isEqual = function (other) {
        other = util.getModularInstance(other);
        if (!(other instanceof QueryImpl)) {
            return false;
        }
        var sameRepo = this._repo === other._repo;
        var samePath = pathEquals(this._path, other._path);
        var sameQueryIdentifier = this._queryIdentifier === other._queryIdentifier;
        return sameRepo && samePath && sameQueryIdentifier;
    };
    QueryImpl.prototype.toJSON = function () {
        return this.toString();
    };
    QueryImpl.prototype.toString = function () {
        return this._repo.toString() + pathToUrlEncodedString(this._path);
    };
    return QueryImpl;
}());
/**
 * Validates that no other order by call has been made
 */
function validateNoPreviousOrderByCall(query, fnName) {
    if (query._orderByCalled === true) {
        throw new Error(fnName + ": You can't combine multiple orderBy calls.");
    }
}
/**
 * Validates start/end values for queries.
 */
function validateQueryEndpoints(params) {
    var startNode = null;
    var endNode = null;
    if (params.hasStart()) {
        startNode = params.getIndexStartValue();
    }
    if (params.hasEnd()) {
        endNode = params.getIndexEndValue();
    }
    if (params.getIndex() === KEY_INDEX) {
        var tooManyArgsError = 'Query: When ordering by key, you may only pass one argument to ' +
            'startAt(), endAt(), or equalTo().';
        var wrongArgTypeError = 'Query: When ordering by key, the argument passed to startAt(), startAfter(), ' +
            'endAt(), endBefore(), or equalTo() must be a string.';
        if (params.hasStart()) {
            var startName = params.getIndexStartName();
            if (startName !== MIN_NAME) {
                throw new Error(tooManyArgsError);
            }
            else if (typeof startNode !== 'string') {
                throw new Error(wrongArgTypeError);
            }
        }
        if (params.hasEnd()) {
            var endName = params.getIndexEndName();
            if (endName !== MAX_NAME) {
                throw new Error(tooManyArgsError);
            }
            else if (typeof endNode !== 'string') {
                throw new Error(wrongArgTypeError);
            }
        }
    }
    else if (params.getIndex() === PRIORITY_INDEX) {
        if ((startNode != null && !isValidPriority(startNode)) ||
            (endNode != null && !isValidPriority(endNode))) {
            throw new Error('Query: When ordering by priority, the first argument passed to startAt(), ' +
                'startAfter() endAt(), endBefore(), or equalTo() must be a valid priority value ' +
                '(null, a number, or a string).');
        }
    }
    else {
        util.assert(params.getIndex() instanceof PathIndex ||
            params.getIndex() === VALUE_INDEX, 'unknown index type.');
        if ((startNode != null && typeof startNode === 'object') ||
            (endNode != null && typeof endNode === 'object')) {
            throw new Error('Query: First argument passed to startAt(), startAfter(), endAt(), endBefore(), or ' +
                'equalTo() cannot be an object.');
        }
    }
}
/**
 * Validates that limit* has been called with the correct combination of parameters
 */
function validateLimit(params) {
    if (params.hasStart() &&
        params.hasEnd() &&
        params.hasLimit() &&
        !params.hasAnchoredLimit()) {
        throw new Error("Query: Can't combine startAt(), startAfter(), endAt(), endBefore(), and limit(). Use " +
            'limitToFirst() or limitToLast() instead.');
    }
}
/**
 * @internal
 */
var ReferenceImpl = /** @class */ (function (_super) {
    tslib.__extends(ReferenceImpl, _super);
    /** @hideconstructor */
    function ReferenceImpl(repo, path) {
        return _super.call(this, repo, path, new QueryParams(), false) || this;
    }
    Object.defineProperty(ReferenceImpl.prototype, "parent", {
        get: function () {
            var parentPath = pathParent(this._path);
            return parentPath === null
                ? null
                : new ReferenceImpl(this._repo, parentPath);
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(ReferenceImpl.prototype, "root", {
        get: function () {
            var ref = this;
            while (ref.parent !== null) {
                ref = ref.parent;
            }
            return ref;
        },
        enumerable: false,
        configurable: true
    });
    return ReferenceImpl;
}(QueryImpl));
/**
 * A `DataSnapshot` contains data from a Database location.
 *
 * Any time you read data from the Database, you receive the data as a
 * `DataSnapshot`. A `DataSnapshot` is passed to the event callbacks you attach
 * with `on()` or `once()`. You can extract the contents of the snapshot as a
 * JavaScript object by calling the `val()` method. Alternatively, you can
 * traverse into the snapshot by calling `child()` to return child snapshots
 * (which you could then call `val()` on).
 *
 * A `DataSnapshot` is an efficiently generated, immutable copy of the data at
 * a Database location. It cannot be modified and will never change (to modify
 * data, you always call the `set()` method on a `Reference` directly).
 */
var DataSnapshot$1 = /** @class */ (function () {
    /**
     * @param _node - A SnapshotNode to wrap.
     * @param ref - The location this snapshot came from.
     * @param _index - The iteration order for this snapshot
     * @hideconstructor
     */
    function DataSnapshot(_node, 
    /**
     * The location of this DataSnapshot.
     */
    ref, _index) {
        this._node = _node;
        this.ref = ref;
        this._index = _index;
    }
    Object.defineProperty(DataSnapshot.prototype, "priority", {
        /**
         * Gets the priority value of the data in this `DataSnapshot`.
         *
         * Applications need not use priority but can order collections by
         * ordinary properties (see
         * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data |Sorting and filtering data}
         * ).
         */
        get: function () {
            // typecast here because we never return deferred values or internal priorities (MAX_PRIORITY)
            return this._node.getPriority().val();
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(DataSnapshot.prototype, "key", {
        /**
         * The key (last part of the path) of the location of this `DataSnapshot`.
         *
         * The last token in a Database location is considered its key. For example,
         * "ada" is the key for the /users/ada/ node. Accessing the key on any
         * `DataSnapshot` will return the key for the location that generated it.
         * However, accessing the key on the root URL of a Database will return
         * `null`.
         */
        get: function () {
            return this.ref.key;
        },
        enumerable: false,
        configurable: true
    });
    Object.defineProperty(DataSnapshot.prototype, "size", {
        /** Returns the number of child properties of this `DataSnapshot`. */
        get: function () {
            return this._node.numChildren();
        },
        enumerable: false,
        configurable: true
    });
    /**
     * Gets another `DataSnapshot` for the location at the specified relative path.
     *
     * Passing a relative path to the `child()` method of a DataSnapshot returns
     * another `DataSnapshot` for the location at the specified relative path. The
     * relative path can either be a simple child name (for example, "ada") or a
     * deeper, slash-separated path (for example, "ada/name/first"). If the child
     * location has no data, an empty `DataSnapshot` (that is, a `DataSnapshot`
     * whose value is `null`) is returned.
     *
     * @param path - A relative path to the location of child data.
     */
    DataSnapshot.prototype.child = function (path) {
        var childPath = new Path(path);
        var childRef = child(this.ref, path);
        return new DataSnapshot(this._node.getChild(childPath), childRef, PRIORITY_INDEX);
    };
    /**
     * Returns true if this `DataSnapshot` contains any data. It is slightly more
     * efficient than using `snapshot.val() !== null`.
     */
    DataSnapshot.prototype.exists = function () {
        return !this._node.isEmpty();
    };
    /**
     * Exports the entire contents of the DataSnapshot as a JavaScript object.
     *
     * The `exportVal()` method is similar to `val()`, except priority information
     * is included (if available), making it suitable for backing up your data.
     *
     * @returns The DataSnapshot's contents as a JavaScript value (Object,
     *   Array, string, number, boolean, or `null`).
     */
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    DataSnapshot.prototype.exportVal = function () {
        return this._node.val(true);
    };
    /**
     * Enumerates the top-level children in the `DataSnapshot`.
     *
     * Because of the way JavaScript objects work, the ordering of data in the
     * JavaScript object returned by `val()` is not guaranteed to match the
     * ordering on the server nor the ordering of `onChildAdded()` events. That is
     * where `forEach()` comes in handy. It guarantees the children of a
     * `DataSnapshot` will be iterated in their query order.
     *
     * If no explicit `orderBy*()` method is used, results are returned
     * ordered by key (unless priorities are used, in which case, results are
     * returned by priority).
     *
     * @param action - A function that will be called for each child DataSnapshot.
     * The callback can return true to cancel further enumeration.
     * @returns true if enumeration was canceled due to your callback returning
     * true.
     */
    DataSnapshot.prototype.forEach = function (action) {
        var _this = this;
        if (this._node.isLeafNode()) {
            return false;
        }
        var childrenNode = this._node;
        // Sanitize the return value to a boolean. ChildrenNode.forEachChild has a weird return type...
        return !!childrenNode.forEachChild(this._index, function (key, node) {
            return action(new DataSnapshot(node, child(_this.ref, key), PRIORITY_INDEX));
        });
    };
    /**
     * Returns true if the specified child path has (non-null) data.
     *
     * @param path - A relative path to the location of a potential child.
     * @returns `true` if data exists at the specified child path; else
     *  `false`.
     */
    DataSnapshot.prototype.hasChild = function (path) {
        var childPath = new Path(path);
        return !this._node.getChild(childPath).isEmpty();
    };
    /**
     * Returns whether or not the `DataSnapshot` has any non-`null` child
     * properties.
     *
     * You can use `hasChildren()` to determine if a `DataSnapshot` has any
     * children. If it does, you can enumerate them using `forEach()`. If it
     * doesn't, then either this snapshot contains a primitive value (which can be
     * retrieved with `val()`) or it is empty (in which case, `val()` will return
     * `null`).
     *
     * @returns true if this snapshot has any children; else false.
     */
    DataSnapshot.prototype.hasChildren = function () {
        if (this._node.isLeafNode()) {
            return false;
        }
        else {
            return !this._node.isEmpty();
        }
    };
    /**
     * Returns a JSON-serializable representation of this object.
     */
    DataSnapshot.prototype.toJSON = function () {
        return this.exportVal();
    };
    /**
     * Extracts a JavaScript value from a `DataSnapshot`.
     *
     * Depending on the data in a `DataSnapshot`, the `val()` method may return a
     * scalar type (string, number, or boolean), an array, or an object. It may
     * also return null, indicating that the `DataSnapshot` is empty (contains no
     * data).
     *
     * @returns The DataSnapshot's contents as a JavaScript value (Object,
     *   Array, string, number, boolean, or `null`).
     */
    // eslint-disable-next-line @typescript-eslint/no-explicit-any
    DataSnapshot.prototype.val = function () {
        return this._node.val();
    };
    return DataSnapshot;
}());
/**
 *
 * Returns a `Reference` representing the location in the Database
 * corresponding to the provided path. If no path is provided, the `Reference`
 * will point to the root of the Database.
 *
 * @param db - The database instance to obtain a reference for.
 * @param path - Optional path representing the location the returned
 *   `Reference` will point. If not provided, the returned `Reference` will
 *   point to the root of the Database.
 * @returns If a path is provided, a `Reference`
 *   pointing to the provided path. Otherwise, a `Reference` pointing to the
 *   root of the Database.
 */
function ref(db, path) {
    db = util.getModularInstance(db);
    db._checkNotDeleted('ref');
    return path !== undefined ? child(db._root, path) : db._root;
}
/**
 * Returns a `Reference` representing the location in the Database
 * corresponding to the provided Firebase URL.
 *
 * An exception is thrown if the URL is not a valid Firebase Database URL or it
 * has a different domain than the current `Database` instance.
 *
 * Note that all query parameters (`orderBy`, `limitToLast`, etc.) are ignored
 * and are not applied to the returned `Reference`.
 *
 * @param db - The database instance to obtain a reference for.
 * @param url - The Firebase URL at which the returned `Reference` will
 *   point.
 * @returns A `Reference` pointing to the provided
 *   Firebase URL.
 */
function refFromURL(db, url) {
    db = util.getModularInstance(db);
    db._checkNotDeleted('refFromURL');
    var parsedURL = parseRepoInfo(url, db._repo.repoInfo_.nodeAdmin);
    validateUrl('refFromURL', parsedURL);
    var repoInfo = parsedURL.repoInfo;
    if (!db._repo.repoInfo_.isCustomHost() &&
        repoInfo.host !== db._repo.repoInfo_.host) {
        fatal('refFromURL' +
            ': Host name does not match the current database: ' +
            '(found ' +
            repoInfo.host +
            ' but expected ' +
            db._repo.repoInfo_.host +
            ')');
    }
    return ref(db, parsedURL.path.toString());
}
/**
 * Gets a `Reference` for the location at the specified relative path.
 *
 * The relative path can either be a simple child name (for example, "ada") or
 * a deeper slash-separated path (for example, "ada/name/first").
 *
 * @param parent - The parent location.
 * @param path - A relative path from this location to the desired child
 *   location.
 * @returns The specified child location.
 */
function child(parent, path) {
    parent = util.getModularInstance(parent);
    if (pathGetFront(parent._path) === null) {
        validateRootPathString('child', 'path', path, false);
    }
    else {
        validatePathString('child', 'path', path, false);
    }
    return new ReferenceImpl(parent._repo, pathChild(parent._path, path));
}
/**
 * Returns an `OnDisconnect` object - see
 * {@link https://firebase.google.com/docs/database/web/offline-capabilities | Enabling Offline Capabilities in JavaScript}
 * for more information on how to use it.
 *
 * @param ref - The reference to add OnDisconnect triggers for.
 */
function onDisconnect(ref) {
    ref = util.getModularInstance(ref);
    return new OnDisconnect$1(ref._repo, ref._path);
}
/**
 * Generates a new child location using a unique key and returns its
 * `Reference`.
 *
 * This is the most common pattern for adding data to a collection of items.
 *
 * If you provide a value to `push()`, the value is written to the
 * generated location. If you don't pass a value, nothing is written to the
 * database and the child remains empty (but you can use the `Reference`
 * elsewhere).
 *
 * The unique keys generated by `push()` are ordered by the current time, so the
 * resulting list of items is chronologically sorted. The keys are also
 * designed to be unguessable (they contain 72 random bits of entropy).
 *
 * See {@link https://firebase.google.com/docs/database/web/lists-of-data#append_to_a_list_of_data | Append to a list of data}
 * </br>See {@link ttps://firebase.googleblog.com/2015/02/the-2120-ways-to-ensure-unique_68.html | The 2^120 Ways to Ensure Unique Identifiers}
 *
 * @param parent - The parent location.
 * @param value - Optional value to be written at the generated location.
 * @returns Combined `Promise` and `Reference`; resolves when write is complete,
 * but can be used immediately as the `Reference` to the child location.
 */
function push(parent, value) {
    parent = util.getModularInstance(parent);
    validateWritablePath('push', parent._path);
    validateFirebaseDataArg('push', value, parent._path, true);
    var now = repoServerTime(parent._repo);
    var name = nextPushId(now);
    // push() returns a ThennableReference whose promise is fulfilled with a
    // regular Reference. We use child() to create handles to two different
    // references. The first is turned into a ThennableReference below by adding
    // then() and catch() methods and is used as the return value of push(). The
    // second remains a regular Reference and is used as the fulfilled value of
    // the first ThennableReference.
    var thennablePushRef = child(parent, name);
    var pushRef = child(parent, name);
    var promise;
    if (value != null) {
        promise = set(pushRef, value).then(function () { return pushRef; });
    }
    else {
        promise = Promise.resolve(pushRef);
    }
    thennablePushRef.then = promise.then.bind(promise);
    thennablePushRef.catch = promise.then.bind(promise, undefined);
    return thennablePushRef;
}
/**
 * Removes the data at this Database location.
 *
 * Any data at child locations will also be deleted.
 *
 * The effect of the remove will be visible immediately and the corresponding
 * event 'value' will be triggered. Synchronization of the remove to the
 * Firebase servers will also be started, and the returned Promise will resolve
 * when complete. If provided, the onComplete callback will be called
 * asynchronously after synchronization has finished.
 *
 * @param ref - The location to remove.
 * @returns Resolves when remove on server is complete.
 */
function remove(ref) {
    validateWritablePath('remove', ref._path);
    return set(ref, null);
}
/**
 * Writes data to this Database location.
 *
 * This will overwrite any data at this location and all child locations.
 *
 * The effect of the write will be visible immediately, and the corresponding
 * events ("value", "child_added", etc.) will be triggered. Synchronization of
 * the data to the Firebase servers will also be started, and the returned
 * Promise will resolve when complete. If provided, the `onComplete` callback
 * will be called asynchronously after synchronization has finished.
 *
 * Passing `null` for the new value is equivalent to calling `remove()`; namely,
 * all data at this location and all child locations will be deleted.
 *
 * `set()` will remove any priority stored at this location, so if priority is
 * meant to be preserved, you need to use `setWithPriority()` instead.
 *
 * Note that modifying data with `set()` will cancel any pending transactions
 * at that location, so extreme care should be taken if mixing `set()` and
 * `transaction()` to modify the same data.
 *
 * A single `set()` will generate a single "value" event at the location where
 * the `set()` was performed.
 *
 * @param ref - The location to write to.
 * @param value - The value to be written (string, number, boolean, object,
 *   array, or null).
 * @returns Resolves when write to server is complete.
 */
function set(ref, value) {
    ref = util.getModularInstance(ref);
    validateWritablePath('set', ref._path);
    validateFirebaseDataArg('set', value, ref._path, false);
    var deferred = new util.Deferred();
    repoSetWithPriority(ref._repo, ref._path, value, 
    /*priority=*/ null, deferred.wrapCallback(function () { }));
    return deferred.promise;
}
/**
 * Sets a priority for the data at this Database location.
 *
 * Applications need not use priority but can order collections by
 * ordinary properties (see
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data | Sorting and filtering data}
 * ).
 *
 * @param ref - The location to write to.
 * @param priority - The priority to be written (string, number, or null).
 * @returns Resolves when write to server is complete.
 */
function setPriority(ref, priority) {
    ref = util.getModularInstance(ref);
    validateWritablePath('setPriority', ref._path);
    validatePriority('setPriority', priority, false);
    var deferred = new util.Deferred();
    repoSetWithPriority(ref._repo, pathChild(ref._path, '.priority'), priority, null, deferred.wrapCallback(function () { }));
    return deferred.promise;
}
/**
 * Writes data the Database location. Like `set()` but also specifies the
 * priority for that data.
 *
 * Applications need not use priority but can order collections by
 * ordinary properties (see
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sorting_and_filtering_data | Sorting and filtering data}
 * ).
 *
 * @param ref - The location to write to.
 * @param value - The value to be written (string, number, boolean, object,
 *   array, or null).
 * @param priority - The priority to be written (string, number, or null).
 * @returns Resolves when write to server is complete.
 */
function setWithPriority(ref, value, priority) {
    validateWritablePath('setWithPriority', ref._path);
    validateFirebaseDataArg('setWithPriority', value, ref._path, false);
    validatePriority('setWithPriority', priority, false);
    if (ref.key === '.length' || ref.key === '.keys') {
        throw 'setWithPriority failed: ' + ref.key + ' is a read-only object.';
    }
    var deferred = new util.Deferred();
    repoSetWithPriority(ref._repo, ref._path, value, priority, deferred.wrapCallback(function () { }));
    return deferred.promise;
}
/**
 * Writes multiple values to the Database at once.
 *
 * The `values` argument contains multiple property-value pairs that will be
 * written to the Database together. Each child property can either be a simple
 * property (for example, "name") or a relative path (for example,
 * "name/first") from the current location to the data to update.
 *
 * As opposed to the `set()` method, `update()` can be use to selectively update
 * only the referenced properties at the current location (instead of replacing
 * all the child properties at the current location).
 *
 * The effect of the write will be visible immediately, and the corresponding
 * events ('value', 'child_added', etc.) will be triggered. Synchronization of
 * the data to the Firebase servers will also be started, and the returned
 * Promise will resolve when complete. If provided, the `onComplete` callback
 * will be called asynchronously after synchronization has finished.
 *
 * A single `update()` will generate a single "value" event at the location
 * where the `update()` was performed, regardless of how many children were
 * modified.
 *
 * Note that modifying data with `update()` will cancel any pending
 * transactions at that location, so extreme care should be taken if mixing
 * `update()` and `transaction()` to modify the same data.
 *
 * Passing `null` to `update()` will remove the data at this location.
 *
 * See
 * {@link https://firebase.googleblog.com/2015/09/introducing-multi-location-updates-and_86.html | Introducing multi-location updates and more}.
 *
 * @param ref - The location to write to.
 * @param values - Object containing multiple values.
 * @returns Resolves when update on server is complete.
 */
function update(ref, values) {
    validateFirebaseMergeDataArg('update', values, ref._path, false);
    var deferred = new util.Deferred();
    repoUpdate(ref._repo, ref._path, values, deferred.wrapCallback(function () { }));
    return deferred.promise;
}
/**
 * Gets the most up-to-date result for this query.
 *
 * @param query - The query to run.
 * @returns A `Promise` which resolves to the resulting DataSnapshot if a value is
 * available, or rejects if the client is unable to return a value (e.g., if the
 * server is unreachable and there is nothing cached).
 */
function get(query) {
    query = util.getModularInstance(query);
    return repoGetValue(query._repo, query).then(function (node) {
        return new DataSnapshot$1(node, new ReferenceImpl(query._repo, query._path), query._queryParams.getIndex());
    });
}
/**
 * Represents registration for 'value' events.
 */
var ValueEventRegistration = /** @class */ (function () {
    function ValueEventRegistration(callbackContext) {
        this.callbackContext = callbackContext;
    }
    ValueEventRegistration.prototype.respondsTo = function (eventType) {
        return eventType === 'value';
    };
    ValueEventRegistration.prototype.createEvent = function (change, query) {
        var index = query._queryParams.getIndex();
        return new DataEvent('value', this, new DataSnapshot$1(change.snapshotNode, new ReferenceImpl(query._repo, query._path), index));
    };
    ValueEventRegistration.prototype.getEventRunner = function (eventData) {
        var _this = this;
        if (eventData.getEventType() === 'cancel') {
            return function () {
                return _this.callbackContext.onCancel(eventData.error);
            };
        }
        else {
            return function () {
                return _this.callbackContext.onValue(eventData.snapshot, null);
            };
        }
    };
    ValueEventRegistration.prototype.createCancelEvent = function (error, path) {
        if (this.callbackContext.hasCancelCallback) {
            return new CancelEvent(this, error, path);
        }
        else {
            return null;
        }
    };
    ValueEventRegistration.prototype.matches = function (other) {
        if (!(other instanceof ValueEventRegistration)) {
            return false;
        }
        else if (!other.callbackContext || !this.callbackContext) {
            // If no callback specified, we consider it to match any callback.
            return true;
        }
        else {
            return other.callbackContext.matches(this.callbackContext);
        }
    };
    ValueEventRegistration.prototype.hasAnyCallback = function () {
        return this.callbackContext !== null;
    };
    return ValueEventRegistration;
}());
/**
 * Represents the registration of a child_x event.
 */
var ChildEventRegistration = /** @class */ (function () {
    function ChildEventRegistration(eventType, callbackContext) {
        this.eventType = eventType;
        this.callbackContext = callbackContext;
    }
    ChildEventRegistration.prototype.respondsTo = function (eventType) {
        var eventToCheck = eventType === 'children_added' ? 'child_added' : eventType;
        eventToCheck =
            eventToCheck === 'children_removed' ? 'child_removed' : eventToCheck;
        return this.eventType === eventToCheck;
    };
    ChildEventRegistration.prototype.createCancelEvent = function (error, path) {
        if (this.callbackContext.hasCancelCallback) {
            return new CancelEvent(this, error, path);
        }
        else {
            return null;
        }
    };
    ChildEventRegistration.prototype.createEvent = function (change, query) {
        util.assert(change.childName != null, 'Child events should have a childName.');
        var childRef = child(new ReferenceImpl(query._repo, query._path), change.childName);
        var index = query._queryParams.getIndex();
        return new DataEvent(change.type, this, new DataSnapshot$1(change.snapshotNode, childRef, index), change.prevName);
    };
    ChildEventRegistration.prototype.getEventRunner = function (eventData) {
        var _this = this;
        if (eventData.getEventType() === 'cancel') {
            return function () {
                return _this.callbackContext.onCancel(eventData.error);
            };
        }
        else {
            return function () {
                return _this.callbackContext.onValue(eventData.snapshot, eventData.prevName);
            };
        }
    };
    ChildEventRegistration.prototype.matches = function (other) {
        if (other instanceof ChildEventRegistration) {
            return (this.eventType === other.eventType &&
                (!this.callbackContext ||
                    !other.callbackContext ||
                    this.callbackContext.matches(other.callbackContext)));
        }
        return false;
    };
    ChildEventRegistration.prototype.hasAnyCallback = function () {
        return !!this.callbackContext;
    };
    return ChildEventRegistration;
}());
function addEventListener(query, eventType, callback, cancelCallbackOrListenOptions, options) {
    var cancelCallback;
    if (typeof cancelCallbackOrListenOptions === 'object') {
        cancelCallback = undefined;
        options = cancelCallbackOrListenOptions;
    }
    if (typeof cancelCallbackOrListenOptions === 'function') {
        cancelCallback = cancelCallbackOrListenOptions;
    }
    if (options && options.onlyOnce) {
        var userCallback_1 = callback;
        var onceCallback = function (dataSnapshot, previousChildName) {
            repoRemoveEventCallbackForQuery(query._repo, query, container);
            userCallback_1(dataSnapshot, previousChildName);
        };
        onceCallback.userCallback = callback.userCallback;
        onceCallback.context = callback.context;
        callback = onceCallback;
    }
    var callbackContext = new CallbackContext(callback, cancelCallback || undefined);
    var container = eventType === 'value'
        ? new ValueEventRegistration(callbackContext)
        : new ChildEventRegistration(eventType, callbackContext);
    repoAddEventCallbackForQuery(query._repo, query, container);
    return function () { return repoRemoveEventCallbackForQuery(query._repo, query, container); };
}
function onValue(query, callback, cancelCallbackOrListenOptions, options) {
    return addEventListener(query, 'value', callback, cancelCallbackOrListenOptions, options);
}
function onChildAdded(query, callback, cancelCallbackOrListenOptions, options) {
    return addEventListener(query, 'child_added', callback, cancelCallbackOrListenOptions, options);
}
function onChildChanged(query, callback, cancelCallbackOrListenOptions, options) {
    return addEventListener(query, 'child_changed', callback, cancelCallbackOrListenOptions, options);
}
function onChildMoved(query, callback, cancelCallbackOrListenOptions, options) {
    return addEventListener(query, 'child_moved', callback, cancelCallbackOrListenOptions, options);
}
function onChildRemoved(query, callback, cancelCallbackOrListenOptions, options) {
    return addEventListener(query, 'child_removed', callback, cancelCallbackOrListenOptions, options);
}
/**
 * Detaches a callback previously attached with `on()`.
 *
 * Detach a callback previously attached with `on()`. Note that if `on()` was
 * called multiple times with the same eventType and callback, the callback
 * will be called multiple times for each event, and `off()` must be called
 * multiple times to remove the callback. Calling `off()` on a parent listener
 * will not automatically remove listeners registered on child nodes, `off()`
 * must also be called on any child listeners to remove the callback.
 *
 * If a callback is not specified, all callbacks for the specified eventType
 * will be removed. Similarly, if no eventType is specified, all callbacks
 * for the `Reference` will be removed.
 *
 * Individual listeners can also be removed by invoking their unsubscribe
 * callbacks.
 *
 * @param query - The query that the listener was registered with.
 * @param eventType - One of the following strings: "value", "child_added",
 * "child_changed", "child_removed", or "child_moved." If omitted, all callbacks
 * for the `Reference` will be removed.
 * @param callback - The callback function that was passed to `on()` or
 * `undefined` to remove all callbacks.
 */
function off(query, eventType, callback) {
    var container = null;
    var expCallback = callback ? new CallbackContext(callback) : null;
    if (eventType === 'value') {
        container = new ValueEventRegistration(expCallback);
    }
    else if (eventType) {
        container = new ChildEventRegistration(eventType, expCallback);
    }
    repoRemoveEventCallbackForQuery(query._repo, query, container);
}
/**
 * A `QueryConstraint` is used to narrow the set of documents returned by a
 * Database query. `QueryConstraint`s are created by invoking {@link endAt},
 * {@link endBefore}, {@link startAt}, {@link startAfter}, {@link
 * limitToFirst}, {@link limitToLast}, {@link orderByChild},
 * {@link orderByChild}, {@link orderByKey} , {@link orderByPriority} ,
 * {@link orderByValue}  or {@link equalTo} and
 * can then be passed to {@link query} to create a new query instance that
 * also contains this `QueryConstraint`.
 */
var QueryConstraint = /** @class */ (function () {
    function QueryConstraint() {
    }
    return QueryConstraint;
}());
var QueryEndAtConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryEndAtConstraint, _super);
    function QueryEndAtConstraint(_value, _key) {
        var _this = _super.call(this) || this;
        _this._value = _value;
        _this._key = _key;
        return _this;
    }
    QueryEndAtConstraint.prototype._apply = function (query) {
        validateFirebaseDataArg('endAt', this._value, query._path, true);
        var newParams = queryParamsEndAt(query._queryParams, this._value, this._key);
        validateLimit(newParams);
        validateQueryEndpoints(newParams);
        if (query._queryParams.hasEnd()) {
            throw new Error('endAt: Starting point was already set (by another call to endAt, ' +
                'endBefore or equalTo).');
        }
        return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);
    };
    return QueryEndAtConstraint;
}(QueryConstraint));
/**
 * Creates a `QueryConstraint` with the specified ending point.
 *
 * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`
 * allows you to choose arbitrary starting and ending points for your queries.
 *
 * The ending point is inclusive, so children with exactly the specified value
 * will be included in the query. The optional key argument can be used to
 * further limit the range of the query. If it is specified, then children that
 * have exactly the specified value must also have a key name less than or equal
 * to the specified key.
 *
 * You can read more about `endAt()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.
 *
 * @param value - The value to end at. The argument type depends on which
 * `orderBy*()` function was used in this query. Specify a value that matches
 * the `orderBy*()` type. When used in combination with `orderByKey()`, the
 * value must be a string.
 * @param key - The child key to end at, among the children with the previously
 * specified priority. This argument is only allowed if ordering by child,
 * value, or priority.
 */
function endAt(value, key) {
    validateKey('endAt', 'key', key, true);
    return new QueryEndAtConstraint(value, key);
}
var QueryEndBeforeConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryEndBeforeConstraint, _super);
    function QueryEndBeforeConstraint(_value, _key) {
        var _this = _super.call(this) || this;
        _this._value = _value;
        _this._key = _key;
        return _this;
    }
    QueryEndBeforeConstraint.prototype._apply = function (query) {
        validateFirebaseDataArg('endBefore', this._value, query._path, false);
        var newParams = queryParamsEndBefore(query._queryParams, this._value, this._key);
        validateLimit(newParams);
        validateQueryEndpoints(newParams);
        if (query._queryParams.hasEnd()) {
            throw new Error('endBefore: Starting point was already set (by another call to endAt, ' +
                'endBefore or equalTo).');
        }
        return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);
    };
    return QueryEndBeforeConstraint;
}(QueryConstraint));
/**
 * Creates a `QueryConstraint` with the specified ending point (exclusive).
 *
 * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`
 * allows you to choose arbitrary starting and ending points for your queries.
 *
 * The ending point is exclusive. If only a value is provided, children
 * with a value less than the specified value will be included in the query.
 * If a key is specified, then children must have a value lesss than or equal
 * to the specified value and a a key name less than the specified key.
 *
 * @param value - The value to end before. The argument type depends on which
 * `orderBy*()` function was used in this query. Specify a value that matches
 * the `orderBy*()` type. When used in combination with `orderByKey()`, the
 * value must be a string.
 * @param key - The child key to end before, among the children with the
 * previously specified priority. This argument is only allowed if ordering by
 * child, value, or priority.
 */
function endBefore(value, key) {
    validateKey('endBefore', 'key', key, true);
    return new QueryEndBeforeConstraint(value, key);
}
var QueryStartAtConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryStartAtConstraint, _super);
    function QueryStartAtConstraint(_value, _key) {
        var _this = _super.call(this) || this;
        _this._value = _value;
        _this._key = _key;
        return _this;
    }
    QueryStartAtConstraint.prototype._apply = function (query) {
        validateFirebaseDataArg('startAt', this._value, query._path, true);
        var newParams = queryParamsStartAt(query._queryParams, this._value, this._key);
        validateLimit(newParams);
        validateQueryEndpoints(newParams);
        if (query._queryParams.hasStart()) {
            throw new Error('startAt: Starting point was already set (by another call to startAt, ' +
                'startBefore or equalTo).');
        }
        return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);
    };
    return QueryStartAtConstraint;
}(QueryConstraint));
/**
 * Creates a `QueryConstraint` with the specified starting point.
 *
 * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`
 * allows you to choose arbitrary starting and ending points for your queries.
 *
 * The starting point is inclusive, so children with exactly the specified value
 * will be included in the query. The optional key argument can be used to
 * further limit the range of the query. If it is specified, then children that
 * have exactly the specified value must also have a key name greater than or
 * equal to the specified key.
 *
 * You can read more about `startAt()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.
 *
 * @param value - The value to start at. The argument type depends on which
 * `orderBy*()` function was used in this query. Specify a value that matches
 * the `orderBy*()` type. When used in combination with `orderByKey()`, the
 * value must be a string.
 * @param key - The child key to start at. This argument is only allowed if
 * ordering by child, value, or priority.
 */
function startAt(value, key) {
    if (value === void 0) { value = null; }
    validateKey('startAt', 'key', key, true);
    return new QueryStartAtConstraint(value, key);
}
var QueryStartAfterConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryStartAfterConstraint, _super);
    function QueryStartAfterConstraint(_value, _key) {
        var _this = _super.call(this) || this;
        _this._value = _value;
        _this._key = _key;
        return _this;
    }
    QueryStartAfterConstraint.prototype._apply = function (query) {
        validateFirebaseDataArg('startAfter', this._value, query._path, false);
        var newParams = queryParamsStartAfter(query._queryParams, this._value, this._key);
        validateLimit(newParams);
        validateQueryEndpoints(newParams);
        if (query._queryParams.hasStart()) {
            throw new Error('startAfter: Starting point was already set (by another call to startAt, ' +
                'startAfter, or equalTo).');
        }
        return new QueryImpl(query._repo, query._path, newParams, query._orderByCalled);
    };
    return QueryStartAfterConstraint;
}(QueryConstraint));
/**
 * Creates a `QueryConstraint` with the specified starting point (exclusive).
 *
 * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`
 * allows you to choose arbitrary starting and ending points for your queries.
 *
 * The starting point is exclusive. If only a value is provided, children
 * with a value greater than the specified value will be included in the query.
 * If a key is specified, then children must have a value greater than or equal
 * to the specified value and a a key name greater than the specified key.
 *
 * @param value - The value to start after. The argument type depends on which
 * `orderBy*()` function was used in this query. Specify a value that matches
 * the `orderBy*()` type. When used in combination with `orderByKey()`, the
 * value must be a string.
 * @param key - The child key to start after. This argument is only allowed if
 * ordering by child, value, or priority.
 */
function startAfter(value, key) {
    validateKey('startAfter', 'key', key, true);
    return new QueryStartAfterConstraint(value, key);
}
var QueryLimitToFirstConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryLimitToFirstConstraint, _super);
    function QueryLimitToFirstConstraint(_limit) {
        var _this = _super.call(this) || this;
        _this._limit = _limit;
        return _this;
    }
    QueryLimitToFirstConstraint.prototype._apply = function (query) {
        if (query._queryParams.hasLimit()) {
            throw new Error('limitToFirst: Limit was already set (by another call to limitToFirst ' +
                'or limitToLast).');
        }
        return new QueryImpl(query._repo, query._path, queryParamsLimitToFirst(query._queryParams, this._limit), query._orderByCalled);
    };
    return QueryLimitToFirstConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that if limited to the first specific number
 * of children.
 *
 * The `limitToFirst()` method is used to set a maximum number of children to be
 * synced for a given callback. If we set a limit of 100, we will initially only
 * receive up to 100 `child_added` events. If we have fewer than 100 messages
 * stored in our Database, a `child_added` event will fire for each message.
 * However, if we have over 100 messages, we will only receive a `child_added`
 * event for the first 100 ordered messages. As items change, we will receive
 * `child_removed` events for each item that drops out of the active list so
 * that the total number stays at 100.
 *
 * You can read more about `limitToFirst()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.
 *
 * @param limit - The maximum number of nodes to include in this query.
 */
function limitToFirst(limit) {
    if (typeof limit !== 'number' || Math.floor(limit) !== limit || limit <= 0) {
        throw new Error('limitToFirst: First argument must be a positive integer.');
    }
    return new QueryLimitToFirstConstraint(limit);
}
var QueryLimitToLastConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryLimitToLastConstraint, _super);
    function QueryLimitToLastConstraint(_limit) {
        var _this = _super.call(this) || this;
        _this._limit = _limit;
        return _this;
    }
    QueryLimitToLastConstraint.prototype._apply = function (query) {
        if (query._queryParams.hasLimit()) {
            throw new Error('limitToLast: Limit was already set (by another call to limitToFirst ' +
                'or limitToLast).');
        }
        return new QueryImpl(query._repo, query._path, queryParamsLimitToLast(query._queryParams, this._limit), query._orderByCalled);
    };
    return QueryLimitToLastConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that is limited to return only the last
 * specified number of children.
 *
 * The `limitToLast()` method is used to set a maximum number of children to be
 * synced for a given callback. If we set a limit of 100, we will initially only
 * receive up to 100 `child_added` events. If we have fewer than 100 messages
 * stored in our Database, a `child_added` event will fire for each message.
 * However, if we have over 100 messages, we will only receive a `child_added`
 * event for the last 100 ordered messages. As items change, we will receive
 * `child_removed` events for each item that drops out of the active list so
 * that the total number stays at 100.
 *
 * You can read more about `limitToLast()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.
 *
 * @param limit - The maximum number of nodes to include in this query.
 */
function limitToLast(limit) {
    if (typeof limit !== 'number' || Math.floor(limit) !== limit || limit <= 0) {
        throw new Error('limitToLast: First argument must be a positive integer.');
    }
    return new QueryLimitToLastConstraint(limit);
}
var QueryOrderByChildConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryOrderByChildConstraint, _super);
    function QueryOrderByChildConstraint(_path) {
        var _this = _super.call(this) || this;
        _this._path = _path;
        return _this;
    }
    QueryOrderByChildConstraint.prototype._apply = function (query) {
        validateNoPreviousOrderByCall(query, 'orderByChild');
        var parsedPath = new Path(this._path);
        if (pathIsEmpty(parsedPath)) {
            throw new Error('orderByChild: cannot pass in empty path. Use orderByValue() instead.');
        }
        var index = new PathIndex(parsedPath);
        var newParams = queryParamsOrderBy(query._queryParams, index);
        validateQueryEndpoints(newParams);
        return new QueryImpl(query._repo, query._path, newParams, 
        /*orderByCalled=*/ true);
    };
    return QueryOrderByChildConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that orders by the specified child key.
 *
 * Queries can only order by one key at a time. Calling `orderByChild()`
 * multiple times on the same query is an error.
 *
 * Firebase queries allow you to order your data by any child key on the fly.
 * However, if you know in advance what your indexes will be, you can define
 * them via the .indexOn rule in your Security Rules for better performance. See
 * the{@link https://firebase.google.com/docs/database/security/indexing-data}
 * rule for more information.
 *
 * You can read more about `orderByChild()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.
 *
 * @param path - The path to order by.
 */
function orderByChild(path) {
    if (path === '$key') {
        throw new Error('orderByChild: "$key" is invalid.  Use orderByKey() instead.');
    }
    else if (path === '$priority') {
        throw new Error('orderByChild: "$priority" is invalid.  Use orderByPriority() instead.');
    }
    else if (path === '$value') {
        throw new Error('orderByChild: "$value" is invalid.  Use orderByValue() instead.');
    }
    validatePathString('orderByChild', 'path', path, false);
    return new QueryOrderByChildConstraint(path);
}
var QueryOrderByKeyConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryOrderByKeyConstraint, _super);
    function QueryOrderByKeyConstraint() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    QueryOrderByKeyConstraint.prototype._apply = function (query) {
        validateNoPreviousOrderByCall(query, 'orderByKey');
        var newParams = queryParamsOrderBy(query._queryParams, KEY_INDEX);
        validateQueryEndpoints(newParams);
        return new QueryImpl(query._repo, query._path, newParams, 
        /*orderByCalled=*/ true);
    };
    return QueryOrderByKeyConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that orders by the key.
 *
 * Sorts the results of a query by their (ascending) key values.
 *
 * You can read more about `orderByKey()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.
 */
function orderByKey() {
    return new QueryOrderByKeyConstraint();
}
var QueryOrderByPriorityConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryOrderByPriorityConstraint, _super);
    function QueryOrderByPriorityConstraint() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    QueryOrderByPriorityConstraint.prototype._apply = function (query) {
        validateNoPreviousOrderByCall(query, 'orderByPriority');
        var newParams = queryParamsOrderBy(query._queryParams, PRIORITY_INDEX);
        validateQueryEndpoints(newParams);
        return new QueryImpl(query._repo, query._path, newParams, 
        /*orderByCalled=*/ true);
    };
    return QueryOrderByPriorityConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that orders by priority.
 *
 * Applications need not use priority but can order collections by
 * ordinary properties (see
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}
 * for alternatives to priority.
 */
function orderByPriority() {
    return new QueryOrderByPriorityConstraint();
}
var QueryOrderByValueConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryOrderByValueConstraint, _super);
    function QueryOrderByValueConstraint() {
        return _super !== null && _super.apply(this, arguments) || this;
    }
    QueryOrderByValueConstraint.prototype._apply = function (query) {
        validateNoPreviousOrderByCall(query, 'orderByValue');
        var newParams = queryParamsOrderBy(query._queryParams, VALUE_INDEX);
        validateQueryEndpoints(newParams);
        return new QueryImpl(query._repo, query._path, newParams, 
        /*orderByCalled=*/ true);
    };
    return QueryOrderByValueConstraint;
}(QueryConstraint));
/**
 * Creates a new `QueryConstraint` that orders by value.
 *
 * If the children of a query are all scalar values (string, number, or
 * boolean), you can order the results by their (ascending) values.
 *
 * You can read more about `orderByValue()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#sort_data | Sort data}.
 */
function orderByValue() {
    return new QueryOrderByValueConstraint();
}
var QueryEqualToValueConstraint = /** @class */ (function (_super) {
    tslib.__extends(QueryEqualToValueConstraint, _super);
    function QueryEqualToValueConstraint(_value, _key) {
        var _this = _super.call(this) || this;
        _this._value = _value;
        _this._key = _key;
        return _this;
    }
    QueryEqualToValueConstraint.prototype._apply = function (query) {
        validateFirebaseDataArg('equalTo', this._value, query._path, false);
        if (query._queryParams.hasStart()) {
            throw new Error('equalTo: Starting point was already set (by another call to startAt/startAfter or ' +
                'equalTo).');
        }
        if (query._queryParams.hasEnd()) {
            throw new Error('equalTo: Ending point was already set (by another call to endAt/endBefore or ' +
                'equalTo).');
        }
        return new QueryEndAtConstraint(this._value, this._key)._apply(new QueryStartAtConstraint(this._value, this._key)._apply(query));
    };
    return QueryEqualToValueConstraint;
}(QueryConstraint));
/**
 * Creates a `QueryConstraint` that includes children that match the specified
 * value.
 *
 * Using `startAt()`, `startAfter()`, `endBefore()`, `endAt()` and `equalTo()`
 * allows you to choose arbitrary starting and ending points for your queries.
 *
 * The optional key argument can be used to further limit the range of the
 * query. If it is specified, then children that have exactly the specified
 * value must also have exactly the specified key as their key name. This can be
 * used to filter result sets with many matches for the same value.
 *
 * You can read more about `equalTo()` in
 * {@link https://firebase.google.com/docs/database/web/lists-of-data#filtering_data | Filtering data}.
 *
 * @param value - The value to match for. The argument type depends on which
 * `orderBy*()` function was used in this query. Specify a value that matches
 * the `orderBy*()` type. When used in combination with `orderByKey()`, the
 * value must be a string.
 * @param key - The child key to start at, among the children with the
 * previously specified priority. This argument is only allowed if ordering by
 * child, value, or priority.
 */
function equalTo(value, key) {
    validateKey('equalTo', 'key', key, true);
    return new QueryEqualToValueConstraint(value, key);
}
/**
 * Creates a new immutable instance of `Query` that is extended to also include
 * additional query constraints.
 *
 * @param query - The Query instance to use as a base for the new constraints.
 * @param queryConstraints - The list of `QueryConstraint`s to apply.
 * @throws if any of the provided query constraints cannot be combined with the
 * existing or new constraints.
 */
function query(query) {
    var e_1, _a;
    var queryConstraints = [];
    for (var _i = 1; _i < arguments.length; _i++) {
        queryConstraints[_i - 1] = arguments[_i];
    }
    var queryImpl = util.getModularInstance(query);
    try {
        for (var queryConstraints_1 = tslib.__values(queryConstraints), queryConstraints_1_1 = queryConstraints_1.next(); !queryConstraints_1_1.done; queryConstraints_1_1 = queryConstraints_1.next()) {
            var constraint = queryConstraints_1_1.value;
            queryImpl = constraint._apply(queryImpl);
        }
    }
    catch (e_1_1) { e_1 = { error: e_1_1 }; }
    finally {
        try {
            if (queryConstraints_1_1 && !queryConstraints_1_1.done && (_a = queryConstraints_1.return)) _a.call(queryConstraints_1);
        }
        finally { if (e_1) throw e_1.error; }
    }
    return queryImpl;
}
/**
 * Define reference constructor in various modules
 *
 * We are doing this here to avoid several circular
 * dependency issues
 */
syncPointSetReferenceConstructor(ReferenceImpl);
syncTreeSetReferenceConstructor(ReferenceImpl);

index_standalone.DataSnapshot = DataSnapshot$1;
index_standalone.Database = Database$1;
var OnDisconnect_1 = index_standalone.OnDisconnect = OnDisconnect$1;
index_standalone.QueryConstraint = QueryConstraint;
index_standalone.TransactionResult = TransactionResult$1;
var _QueryImpl = index_standalone._QueryImpl = QueryImpl;
var _QueryParams = index_standalone._QueryParams = QueryParams;
var _ReferenceImpl = index_standalone._ReferenceImpl = ReferenceImpl;
index_standalone._TEST_ACCESS_forceRestClient = forceRestClient;
index_standalone._TEST_ACCESS_hijackHash = hijackHash;
var _repoManagerDatabaseFromApp = index_standalone._repoManagerDatabaseFromApp = repoManagerDatabaseFromApp;
var _setSDKVersion = index_standalone._setSDKVersion = setSDKVersion;
var _validatePathString = index_standalone._validatePathString = validatePathString;
var _validateWritablePath = index_standalone._validateWritablePath = validateWritablePath;
var child_1 = index_standalone.child = child;
var connectDatabaseEmulator_1 = index_standalone.connectDatabaseEmulator = connectDatabaseEmulator;
var enableLogging_1 = index_standalone.enableLogging = enableLogging;
var endAt_1 = index_standalone.endAt = endAt;
var endBefore_1 = index_standalone.endBefore = endBefore;
var equalTo_1 = index_standalone.equalTo = equalTo;
var forceLongPolling_1 = index_standalone.forceLongPolling = forceLongPolling;
var forceWebSockets_1 = index_standalone.forceWebSockets = forceWebSockets;
var get_1 = index_standalone.get = get;
var goOffline_1 = index_standalone.goOffline = goOffline;
var goOnline_1 = index_standalone.goOnline = goOnline;
var increment_1 = index_standalone.increment = increment;
var limitToFirst_1 = index_standalone.limitToFirst = limitToFirst;
var limitToLast_1 = index_standalone.limitToLast = limitToLast;
var off_1 = index_standalone.off = off;
var onChildAdded_1 = index_standalone.onChildAdded = onChildAdded;
var onChildChanged_1 = index_standalone.onChildChanged = onChildChanged;
var onChildMoved_1 = index_standalone.onChildMoved = onChildMoved;
var onChildRemoved_1 = index_standalone.onChildRemoved = onChildRemoved;
index_standalone.onDisconnect = onDisconnect;
var onValue_1 = index_standalone.onValue = onValue;
var orderByChild_1 = index_standalone.orderByChild = orderByChild;
var orderByKey_1 = index_standalone.orderByKey = orderByKey;
var orderByPriority_1 = index_standalone.orderByPriority = orderByPriority;
var orderByValue_1 = index_standalone.orderByValue = orderByValue;
var push_1 = index_standalone.push = push;
var query_1 = index_standalone.query = query;
var ref_1 = index_standalone.ref = ref;
var refFromURL_1 = index_standalone.refFromURL = refFromURL;
var remove_1 = index_standalone.remove = remove;
var runTransaction_1 = index_standalone.runTransaction = runTransaction;
var serverTimestamp_1 = index_standalone.serverTimestamp = serverTimestamp;
var set_1 = index_standalone.set = set;
var setPriority_1 = index_standalone.setPriority = setPriority;
var setWithPriority_1 = index_standalone.setWithPriority = setWithPriority;
var startAfter_1 = index_standalone.startAfter = startAfter;
var startAt_1 = index_standalone.startAt = startAt;
var update_1 = index_standalone.update = update;

var INTERNAL = /*#__PURE__*/Object.freeze({
  __proto__: null,
  initStandalone: initStandalone$1
});

exports.DataSnapshot = DataSnapshot;
exports.Database = Database;
exports.OnDisconnect = OnDisconnect_1;
exports.Query = Query;
exports.Reference = Reference;
exports.ServerValue = ServerValue;
exports.enableLogging = enableLogging_1;
exports.initStandalone = initStandalone;
//# sourceMappingURL=index.standalone.js.map

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