Performance

Deno supports User Timing Level 3 which is not widely supported yet in other runtimes.

Check out the Performance API documentation on MDN for further information about how to use the API.

interface Performance {mark(markName: string, options?: PerformanceMarkOptions): PerformanceMark;
measure(measureName: string, options?: PerformanceMeasureOptions): PerformanceMeasure;
}

class Performance extends EventTarget {

constructor();


readonly timeOrigin: number;



clearMarks(markName?: string): void;

clearMeasures(measureName?: string): void;

getEntries(): PerformanceEntryList;

getEntriesByName(name: string, type?: string): PerformanceEntryList;

getEntriesByType(type: string): PerformanceEntryList;

mark(markName: string, options?: PerformanceMarkOptions): PerformanceMark;

measure(measureName: string, options?: PerformanceMeasureOptions): PerformanceMeasure;

measure(
measureName: string,

startMark?: string,

endMark?: string,
): PerformanceMeasure;

now(): number;

toJSON(): any;

}

Methods

mark(markName: string, options?: PerformanceMarkOptions): PerformanceMark

Stores a timestamp with the associated name (a "mark").

measure(measureName: string, options?: PerformanceMeasureOptions): PerformanceMeasure

Stores the DOMHighResTimeStamp duration between two marks along with the associated name (a "measure").

Extends

EventTarget

Constructors

new Performance()

Properties

timeOrigin: number

Returns a timestamp representing the start of the performance measurement.

Methods

clearMarks(markName?: string): void

Removes the stored timestamp with the associated name.

clearMeasures(measureName?: string): void

Removes stored timestamp with the associated name.

getEntries(): PerformanceEntryList

getEntriesByName(name: string, type?: string): PerformanceEntryList

getEntriesByType(type: string): PerformanceEntryList

mark(markName: string, options?: PerformanceMarkOptions): PerformanceMark

Stores a timestamp with the associated name (a "mark").

measure(measureName: string, options?: PerformanceMeasureOptions): PerformanceMeasure

Stores the DOMHighResTimeStamp duration between two marks along with the associated name (a "measure").

measure(measureName: string, startMark?: string, endMark?: string): PerformanceMeasure

Stores the DOMHighResTimeStamp duration between two marks along with the associated name (a "measure").

now(): number

Returns a current time from Deno's start in milliseconds.

Use the permission flag --allow-hrtime return a precise value.

const t = performance.now();
console.log(`${t} ms since start!`);

toJSON(): any

Returns a JSON representation of the performance object.