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declare module "perf_hooks" {
import { AsyncResource } from "async_hooks";
interface PerformanceEntry {
/**
* The total number of milliseconds elapsed for this entry.
* This value will not be meaningful for all Performance Entry types.
*/
readonly duration: number;
/**
* The name of the performance entry.
*/
readonly name: string;
/**
* The high resolution millisecond timestamp marking the starting time of the Performance Entry.
*/
readonly startTime: number;
/**
* The type of the performance entry.
* Currently it may be one of: 'node', 'mark', 'measure', 'gc', or 'function'.
*/
readonly entryType: string;
/**
* When performanceEntry.entryType is equal to 'gc', the performance.kind property identifies
* the type of garbage collection operation that occurred.
* The value may be one of perf_hooks.constants.
*/
readonly kind?: number;
}
interface PerformanceNodeTiming extends PerformanceEntry {
/**
* The high resolution millisecond timestamp at which the Node.js process completed bootstrap.
*/
readonly bootstrapComplete: number;
/**
* The high resolution millisecond timestamp at which cluster processing ended.
*/
readonly clusterSetupEnd: number;
/**
* The high resolution millisecond timestamp at which cluster processing started.
*/
readonly clusterSetupStart: number;
/**
* The high resolution millisecond timestamp at which the Node.js event loop exited.
*/
readonly loopExit: number;
/**
* The high resolution millisecond timestamp at which the Node.js event loop started.
*/
readonly loopStart: number;
/**
* The high resolution millisecond timestamp at which main module load ended.
*/
readonly moduleLoadEnd: number;
/**
* The high resolution millisecond timestamp at which main module load started.
*/
readonly moduleLoadStart: number;
/**
* The high resolution millisecond timestamp at which the Node.js process was initialized.
*/
readonly nodeStart: number;
/**
* The high resolution millisecond timestamp at which preload module load ended.
*/
readonly preloadModuleLoadEnd: number;
/**
* The high resolution millisecond timestamp at which preload module load started.
*/
readonly preloadModuleLoadStart: number;
/**
* The high resolution millisecond timestamp at which third_party_main processing ended.
*/
readonly thirdPartyMainEnd: number;
/**
* The high resolution millisecond timestamp at which third_party_main processing started.
*/
readonly thirdPartyMainStart: number;
/**
* The high resolution millisecond timestamp at which the V8 platform was initialized.
*/
readonly v8Start: number;
}
interface Performance {
/**
* If name is not provided, removes all PerformanceFunction objects from the Performance Timeline.
* If name is provided, removes entries with name.
* @param name
*/
clearFunctions(name?: string): void;
/**
* 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 objects whose performanceEntry.name matches name.
*/
clearMeasures(name?: string): void;
/**
* Returns a list of all PerformanceEntry objects in chronological order with respect to performanceEntry.startTime.
* @return list of all PerformanceEntry objects
*/
getEntries(): PerformanceEntry[];
/**
* Returns a list of all 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
* @return list of all PerformanceEntry objects
*/
getEntriesByName(name: string, type?: string): PerformanceEntry[];
/**
* Returns a list of all PerformanceEntry objects in chronological order with respect to performanceEntry.startTime
* whose performanceEntry.entryType is equal to type.
* @param type
* @return list of all PerformanceEntry objects
*/
getEntriesByType(type: string): 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
*/
mark(name?: string): void;
/**
* 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
*/
measure(name: string, startMark: string, endMark: string): void;
/**
* 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 (...optionalParams: any[]) => any>(fn: T): T;
}
interface PerformanceObserverEntryList {
/**
* @return a list of PerformanceEntry objects in chronological order with respect to performanceEntry.startTime.
*/
getEntries(): PerformanceEntry[];
/**
* @return 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.
*/
getEntriesByName(name: string, type?: string): PerformanceEntry[];
/**
* @return Returns a list of PerformanceEntry objects in chronological order with respect to performanceEntry.startTime
* whose performanceEntry.entryType is equal to type.
*/
getEntriesByType(type: string): PerformanceEntry[];
}
type PerformanceObserverCallback = (list: PerformanceObserverEntryList, observer: PerformanceObserver) => void;
class PerformanceObserver extends AsyncResource {
constructor(callback: PerformanceObserverCallback);
/**
* Disconnects the PerformanceObserver instance from all notifications.
*/
disconnect(): void;
/**
* Subscribes the PerformanceObserver instance to notifications of new PerformanceEntry instances identified by options.entryTypes.
* When options.buffered is false, the callback will be invoked once for every PerformanceEntry instance.
* Property buffered defaults to false.
* @param options
*/
observe(options: { entryTypes: string[], buffered?: boolean }): 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 performance: Performance;
}
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