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interface 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.

Methods #

#mark(
markName: string,
): PerformanceMark

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

#measure(
measureName: string,
): PerformanceMeasure

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

Properties #

#timeOrigin: number
readonly

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.

#clearResourceTimings(): void

Removes all performance entries with an entryType of "resource" from the performance timeline and sets the size of the performance resource data buffer to zero.

Note: Deno does not currently track resource timings, so this method has no observable effect. It is provided for API compatibility.

#setResourceTimingBufferSize(maxSize: number): void

Sets the desired size of the browser's resource timing buffer which stores the "resource" performance entries.

Note: Deno does not currently track resource timings, so this method has no observable effect. It is provided for API compatibility.

#getEntriesByName(
name: string,
type?: string,
): PerformanceEntryList
#mark(
markName: string,
): PerformanceMark

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

#measure(
measureName: string,
): 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 fractional milliseconds.

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

Returns a JSON representation of the performance object.

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