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/var/www/greso.tech/server/nsm/node_modules/@types/node/ts4.8
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/var/www/greso.tech/server/nsm/node_modules/@types/node/ts4.8/perf_hooks.d.ts
(24303B)
/** * This module provides an implementation of a subset of the W3C [Web Performance APIs](https://w3c.github.io/perf-timing-primer/) as well as additional APIs for * Node.js-specific performance measurements. * * Node.js supports the following [Web Performance APIs](https://w3c.github.io/perf-timing-primer/): * * * [High Resolution Time](https://www.w3.org/TR/hr-time-2) * * [Performance Timeline](https://w3c.github.io/performance-timeline/) * * [User Timing](https://www.w3.org/TR/user-timing/) * * [Resource Timing](https://www.w3.org/TR/resource-timing-2/) * * ```js * const { PerformanceObserver, performance } = require('node:perf_hooks'); * * const obs = new PerformanceObserver((items) => { * console.log(items.getEntries()[0].duration); * performance.clearMarks(); * }); * obs.observe({ type: 'measure' }); * performance.measure('Start to Now'); * * performance.mark('A'); * doSomeLongRunningProcess(() => { * performance.measure('A to Now', 'A'); * * performance.mark('B'); * performance.measure('A to B', 'A', 'B'); * }); * ``` * @see [source](https://github.com/nodejs/node/blob/v20.2.0/lib/perf_hooks.js) */ declare module 'perf_hooks' { import { AsyncResource } from 'node:async_hooks'; type EntryType = 'node' | 'mark' | 'measure' | 'gc' | 'function' | 'http2' | 'http'; interface NodeGCPerformanceDetail { /** * When `performanceEntry.entryType` is equal to 'gc', `the performance.kind` property identifies * the type of garbage collection operation that occurred. * See perf_hooks.constants for valid values. */ readonly kind?: number | undefined; /** * When `performanceEntry.entryType` is equal to 'gc', the `performance.flags` * property contains additional information about garbage collection operation. * See perf_hooks.constants for valid values. */ readonly flags?: number | undefined; } /** * The constructor of this class is not exposed to users directly. * @since v8.5.0 */ class PerformanceEntry { protected constructor(); /** * The total number of milliseconds elapsed for this entry. This value will not * be meaningful for all Performance Entry types. * @since v8.5.0 */ readonly duration: number; /** * The name of the performance entry. * @since v8.5.0 */ readonly name: string; /** * The high resolution millisecond timestamp marking the starting time of the * Performance Entry. * @since v8.5.0 */ readonly startTime: number; /** * The type of the performance entry. It may be one of: * * * `'node'` (Node.js only) * * `'mark'` (available on the Web) * * `'measure'` (available on the Web) * * `'gc'` (Node.js only) * * `'function'` (Node.js only) * * `'http2'` (Node.js only) * * `'http'` (Node.js only) * @since v8.5.0 */ readonly entryType: EntryType; /** * Additional detail specific to the `entryType`. * @since v16.0.0 */ readonly detail?: NodeGCPerformanceDetail | unknown | undefined; // TODO: Narrow this based on entry type. toJSON(): any; } /** * Exposes marks created via the `Performance.mark()` method. * @since v18.2.0, v16.17.0 */ class PerformanceMark extends PerformanceEntry { readonly duration: 0; readonly entryType: 'mark'; } /** * Exposes measures created via the `Performance.measure()` method. * * The constructor of this class is not exposed to users directly. * @since v18.2.0, v16.17.0 */ class PerformanceMeasure extends PerformanceEntry { readonly entryType: 'measure'; } /** * _This property is an extension by Node.js. It is not available in Web browsers._ * * Provides timing details for Node.js itself. The constructor of this class * is not exposed to users. * @since v8.5.0 */ class PerformanceNodeTiming extends PerformanceEntry { /** * The high resolution millisecond timestamp at which the Node.js process * completed bootstrapping. If bootstrapping has not yet finished, the property * has the value of -1. * @since v8.5.0 */ readonly bootstrapComplete: number; /** * The high resolution millisecond timestamp at which the Node.js environment was * initialized. * @since v8.5.0 */ readonly environment: number; /** * The high resolution millisecond timestamp of the amount of time the event loop * has been idle within the event loop's event provider (e.g. `epoll_wait`). This * does not take CPU usage into consideration. If the event loop has not yet * started (e.g., in the first tick of the main script), the property has the * value of 0. * @since v14.10.0, v12.19.0 */ readonly idleTime: number; /** * The high resolution millisecond timestamp at which the Node.js event loop * exited. If the event loop has not yet exited, the property has the value of -1\. * It can only have a value of not -1 in a handler of the `'exit'` event. * @since v8.5.0 */ readonly loopExit: number; /** * The high resolution millisecond timestamp at which the Node.js event loop * started. If the event loop has not yet started (e.g., in the first tick of the * main script), the property has the value of -1. * @since v8.5.0 */ readonly loopStart: number; /** * The high resolution millisecond timestamp at which the V8 platform was * initialized. * @since v8.5.0 */ readonly v8Start: number; } interface EventLoopUtilization { idle: number; active: number; utilization: number; } /** * @param util1 The result of a previous call to eventLoopUtilization() * @param util2 The result of a previous call to eventLoopUtilization() prior to util1 */ type EventLoopUtilityFunction = (util1?: EventLoopUtilization, util2?: EventLoopUtilization) => EventLoopUtilization; interface MarkOptions { /** * Additional optional detail to include with the mark. */ detail?: unknown | undefined; /** * An optional timestamp to be used as the mark time. * @default `performance.now()`. */ startTime?: number | undefined; } interface MeasureOptions { /** * Additional optional detail to include with the mark. */ detail?: unknown | undefined; /** * Duration between start and end times. */ duration?: number | undefined; /** * Timestamp to be used as the end time, or a string identifying a previously recorded mark. */ end?: number | string | undefined; /** * Timestamp to be used as the start time, or a string identifying a previously recorded mark. */ start?: number | string | undefined; } interface TimerifyOptions { /** * A histogram object created using * `perf_hooks.createHistogram()` that will record runtime durations in * nanoseconds. */ histogram?: RecordableHistogram | undefined; } interface Performance { /** * If name is not provided, removes all PerformanceMark objects from the Performance Timeline. * If name is provided, removes only the named mark. * @param name */ clearMarks(name?: string): void; /** * If name is not provided, removes all PerformanceMeasure objects from the Performance Timeline. * If name is provided, removes only the named measure. * @param name * @since v16.7.0 */ clearMeasures(name?: string): void; /** * Returns a list of `PerformanceEntry` objects in chronological order with respect to `performanceEntry.startTime`. * If you are only interested in performance entries of certain types or that have certain names, see * `performance.getEntriesByType()` and `performance.getEntriesByName()`. * @since v16.7.0 */ getEntries(): PerformanceEntry[]; /** * Returns a list of `PerformanceEntry` objects in chronological order with respect to `performanceEntry.startTime` * whose `performanceEntry.name` is equal to `name`, and optionally, whose `performanceEntry.entryType` is equal to `type`. * @param name * @param type * @since v16.7.0 */ getEntriesByName(name: string, type?: EntryType): PerformanceEntry[]; /** * Returns a list of `PerformanceEntry` objects in chronological order with respect to `performanceEntry.startTime` * whose `performanceEntry.entryType` is equal to `type`. * @param type * @since v16.7.0 */ getEntriesByType(type: EntryType): PerformanceEntry[]; /** * Creates a new PerformanceMark entry in the Performance Timeline. * A PerformanceMark is a subclass of PerformanceEntry whose performanceEntry.entryType is always 'mark', * and whose performanceEntry.duration is always 0. * Performance marks are used to mark specific significant moments in the Performance Timeline. * @param name * @return The PerformanceMark entry that was created */ mark(name?: string, options?: MarkOptions): PerformanceMark; /** * Creates a new PerformanceMeasure entry in the Performance Timeline. * A PerformanceMeasure is a subclass of PerformanceEntry whose performanceEntry.entryType is always 'measure', * and whose performanceEntry.duration measures the number of milliseconds elapsed since startMark and endMark. * * The startMark argument may identify any existing PerformanceMark in the the Performance Timeline, or may identify * any of the timestamp properties provided by the PerformanceNodeTiming class. If the named startMark does not exist, * then startMark is set to timeOrigin by default. * * The endMark argument must identify any existing PerformanceMark in the the Performance Timeline or any of the timestamp * properties provided by the PerformanceNodeTiming class. If the named endMark does not exist, an error will be thrown. * @param name * @param startMark * @param endMark * @return The PerformanceMeasure entry that was created */ measure(name: string, startMark?: string, endMark?: string): PerformanceMeasure; measure(name: string, options: MeasureOptions): PerformanceMeasure; /** * An instance of the PerformanceNodeTiming class that provides performance metrics for specific Node.js operational milestones. */ readonly nodeTiming: PerformanceNodeTiming; /** * @return the current high resolution millisecond timestamp */ now(): number; /** * The timeOrigin specifies the high resolution millisecond timestamp from which all performance metric durations are measured. */ readonly timeOrigin: number; /** * Wraps a function within a new function that measures the running time of the wrapped function. * A PerformanceObserver must be subscribed to the 'function' event type in order for the timing details to be accessed. * @param fn */ timerify<T extends (...params: any[]) => any>(fn: T, options?: TimerifyOptions): T; /** * eventLoopUtilization is similar to CPU utilization except that it is calculated using high precision wall-clock time. * It represents the percentage of time the event loop has spent outside the event loop's event provider (e.g. epoll_wait). * No other CPU idle time is taken into consideration. */ eventLoopUtilization: EventLoopUtilityFunction; } interface PerformanceObserverEntryList { /** * Returns a list of `PerformanceEntry` objects in chronological order * with respect to `performanceEntry.startTime`. * * ```js * const { * performance, * PerformanceObserver, * } = require('node:perf_hooks'); * * const obs = new PerformanceObserver((perfObserverList, observer) => { * console.log(perfObserverList.getEntries()); * * * [ * * PerformanceEntry { * * name: 'test', * * entryType: 'mark', * * startTime: 81.465639, * * duration: 0 * * }, * * PerformanceEntry { * * name: 'meow', * * entryType: 'mark', * * startTime: 81.860064, * * duration: 0 * * } * * ] * * * performance.clearMarks(); * performance.clearMeasures(); * observer.disconnect(); * }); * obs.observe({ type: 'mark' }); * * performance.mark('test'); * performance.mark('meow'); * ``` * @since v8.5.0 */ getEntries(): PerformanceEntry[]; /** * Returns a list of `PerformanceEntry` objects in chronological order * with respect to `performanceEntry.startTime` whose `performanceEntry.name` is * equal to `name`, and optionally, whose `performanceEntry.entryType` is equal to`type`. * * ```js * const { * performance, * PerformanceObserver, * } = require('node:perf_hooks'); * * const obs = new PerformanceObserver((perfObserverList, observer) => { * console.log(perfObserverList.getEntriesByName('meow')); * * * [ * * PerformanceEntry { * * name: 'meow', * * entryType: 'mark', * * startTime: 98.545991, * * duration: 0 * * } * * ] * * console.log(perfObserverList.getEntriesByName('nope')); // [] * * console.log(perfObserverList.getEntriesByName('test', 'mark')); * * * [ * * PerformanceEntry { * * name: 'test', * * entryType: 'mark', * * startTime: 63.518931, * * duration: 0 * * } * * ] * * console.log(perfObserverList.getEntriesByName('test', 'measure')); // [] * * performance.clearMarks(); * performance.clearMeasures(); * observer.disconnect(); * }); * obs.observe({ entryTypes: ['mark', 'measure'] }); * * performance.mark('test'); * performance.mark('meow'); * ``` * @since v8.5.0 */ getEntriesByName(name: string, type?: EntryType): PerformanceEntry[]; /** * Returns a list of `PerformanceEntry` objects in chronological order * with respect to `performanceEntry.startTime` whose `performanceEntry.entryType`is equal to `type`. * * ```js * const { * performance, * PerformanceObserver, * } = require('node:perf_hooks'); * * const obs = new PerformanceObserver((perfObserverList, observer) => { * console.log(perfObserverList.getEntriesByType('mark')); * * * [ * * PerformanceEntry { * * name: 'test', * * entryType: 'mark', * * startTime: 55.897834, * * duration: 0 * * }, * * PerformanceEntry { * * name: 'meow', * * entryType: 'mark', * * startTime: 56.350146, * * duration: 0 * * } * * ] * * performance.clearMarks(); * performance.clearMeasures(); * observer.disconnect(); * }); * obs.observe({ type: 'mark' }); * * performance.mark('test'); * performance.mark('meow'); * ``` * @since v8.5.0 */ getEntriesByType(type: EntryType): PerformanceEntry[]; } type PerformanceObserverCallback = (list: PerformanceObserverEntryList, observer: PerformanceObserver) => void; /** * @since v8.5.0 */ class PerformanceObserver extends AsyncResource { constructor(callback: PerformanceObserverCallback); /** * Disconnects the `PerformanceObserver` instance from all notifications. * @since v8.5.0 */ disconnect(): void; /** * Subscribes the `PerformanceObserver` instance to notifications of new `PerformanceEntry` instances identified either by `options.entryTypes`or `options.type`: * * ```js * const { * performance, * PerformanceObserver, * } = require('node:perf_hooks'); * * const obs = new PerformanceObserver((list, observer) => { * // Called once asynchronously. `list` contains three items. * }); * obs.observe({ type: 'mark' }); * * for (let n = 0; n < 3; n++) * performance.mark(`test${n}`); * ``` * @since v8.5.0 */ observe( options: | { entryTypes: ReadonlyArray<EntryType>; buffered?: boolean | undefined; } | { type: EntryType; buffered?: boolean | undefined; } ): void; } namespace constants { const NODE_PERFORMANCE_GC_MAJOR: number; const NODE_PERFORMANCE_GC_MINOR: number; const NODE_PERFORMANCE_GC_INCREMENTAL: number; const NODE_PERFORMANCE_GC_WEAKCB: number; const NODE_PERFORMANCE_GC_FLAGS_NO: number; const NODE_PERFORMANCE_GC_FLAGS_CONSTRUCT_RETAINED: number; const NODE_PERFORMANCE_GC_FLAGS_FORCED: number; const NODE_PERFORMANCE_GC_FLAGS_SYNCHRONOUS_PHANTOM_PROCESSING: number; const NODE_PERFORMANCE_GC_FLAGS_ALL_AVAILABLE_GARBAGE: number; const NODE_PERFORMANCE_GC_FLAGS_ALL_EXTERNAL_MEMORY: number; const NODE_PERFORMANCE_GC_FLAGS_SCHEDULE_IDLE: number; } const performance: Performance; interface EventLoopMonitorOptions { /** * The sampling rate in milliseconds. * Must be greater than zero. * @default 10 */ resolution?: number | undefined; } interface Histogram { /** * Returns a `Map` object detailing the accumulated percentile distribution. * @since v11.10.0 */ readonly percentiles: Map<number, number>; /** * The number of times the event loop delay exceeded the maximum 1 hour event * loop delay threshold. * @since v11.10.0 */ readonly exceeds: number; /** * The minimum recorded event loop delay. * @since v11.10.0 */ readonly min: number; /** * The maximum recorded event loop delay. * @since v11.10.0 */ readonly max: number; /** * The mean of the recorded event loop delays. * @since v11.10.0 */ readonly mean: number; /** * The standard deviation of the recorded event loop delays. * @since v11.10.0 */ readonly stddev: number; /** * Resets the collected histogram data. * @since v11.10.0 */ reset(): void; /** * Returns the value at the given percentile. * @since v11.10.0 * @param percentile A percentile value in the range (0, 100]. */ percentile(percentile: number): number; } interface IntervalHistogram extends Histogram { /** * Enables the update interval timer. Returns `true` if the timer was * started, `false` if it was already started. * @since v11.10.0 */ enable(): boolean; /** * Disables the update interval timer. Returns `true` if the timer was * stopped, `false` if it was already stopped. * @since v11.10.0 */ disable(): boolean; } interface RecordableHistogram extends Histogram { /** * @since v15.9.0, v14.18.0 * @param val The amount to record in the histogram. */ record(val: number | bigint): void; /** * Calculates the amount of time (in nanoseconds) that has passed since the * previous call to `recordDelta()` and records that amount in the histogram. * * ## Examples * @since v15.9.0, v14.18.0 */ recordDelta(): void; /** * Adds the values from `other` to this histogram. * @since v17.4.0, v16.14.0 */ add(other: RecordableHistogram): void; } /** * _This property is an extension by Node.js. It is not available in Web browsers._ * * Creates an `IntervalHistogram` object that samples and reports the event loop * delay over time. The delays will be reported in nanoseconds. * * Using a timer to detect approximate event loop delay works because the * execution of timers is tied specifically to the lifecycle of the libuv * event loop. That is, a delay in the loop will cause a delay in the execution * of the timer, and those delays are specifically what this API is intended to * detect. * * ```js * const { monitorEventLoopDelay } = require('node:perf_hooks'); * const h = monitorEventLoopDelay({ resolution: 20 }); * h.enable(); * // Do something. * h.disable(); * console.log(h.min); * console.log(h.max); * console.log(h.mean); * console.log(h.stddev); * console.log(h.percentiles); * console.log(h.percentile(50)); * console.log(h.percentile(99)); * ``` * @since v11.10.0 */ function monitorEventLoopDelay(options?: EventLoopMonitorOptions): IntervalHistogram; interface CreateHistogramOptions { /** * The minimum recordable value. Must be an integer value greater than 0. * @default 1 */ min?: number | bigint | undefined; /** * The maximum recordable value. Must be an integer value greater than min. * @default Number.MAX_SAFE_INTEGER */ max?: number | bigint | undefined; /** * The number of accuracy digits. Must be a number between 1 and 5. * @default 3 */ figures?: number | undefined; } /** * Returns a `RecordableHistogram`. * @since v15.9.0, v14.18.0 */ function createHistogram(options?: CreateHistogramOptions): RecordableHistogram; import { performance as _performance } from 'perf_hooks'; global { /** * `performance` is a global reference for `require('perf_hooks').performance` * https://nodejs.org/api/globals.html#performance * @since v16.0.0 */ var performance: typeof globalThis extends { onmessage: any; performance: infer T; } ? T : typeof _performance; } } declare module 'node:perf_hooks' { export * from 'perf_hooks'; }
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