79 lines
2.1 KiB
JavaScript
79 lines
2.1 KiB
JavaScript
/**
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* Copyright (c) Meta Platforms, Inc. and affiliates.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*
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* @flow strict
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* @format
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*/
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import NativePerformanceObserver from './NativePerformanceObserver';
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import {warnNoNativePerformanceObserver} from './PerformanceObserver';
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type EventCountsForEachCallbackType =
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| (() => void)
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| ((value: number) => void)
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| ((value: number, key: string) => void)
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| ((value: number, key: string, map: Map<string, number>) => void);
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let cachedEventCounts: ?Map<string, number>;
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function getCachedEventCounts(): Map<string, number> {
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if (cachedEventCounts) {
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return cachedEventCounts;
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}
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if (!NativePerformanceObserver) {
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warnNoNativePerformanceObserver();
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return new Map();
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}
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cachedEventCounts = new Map<string, number>(
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NativePerformanceObserver.getEventCounts(),
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);
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// $FlowFixMe[incompatible-call]
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global.queueMicrotask(() => {
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// To be consistent with the calls to the API from the same task,
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// but also not to refetch the data from native too often,
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// schedule to invalidate the cache later,
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// after the current task is guaranteed to have finished.
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cachedEventCounts = null;
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});
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return cachedEventCounts ?? new Map();
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}
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/**
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* Implementation of the EventCounts Web Performance API
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* corresponding to the standard in
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* https://www.w3.org/TR/event-timing/#eventcounts
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*/
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export default class EventCounts {
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// flowlint unsafe-getters-setters:off
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get size(): number {
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return getCachedEventCounts().size;
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}
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entries(): Iterator<[string, number]> {
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return getCachedEventCounts().entries();
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}
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forEach(callback: EventCountsForEachCallbackType): void {
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return getCachedEventCounts().forEach(callback);
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}
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get(key: string): ?number {
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return getCachedEventCounts().get(key);
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}
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has(key: string): boolean {
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return getCachedEventCounts().has(key);
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}
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keys(): Iterator<string> {
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return getCachedEventCounts().keys();
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}
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values(): Iterator<number> {
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return getCachedEventCounts().values();
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}
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}
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