88 lines
2.7 KiB
TypeScript
88 lines
2.7 KiB
TypeScript
/*
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* Copyright 2020 Google LLC
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* https://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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import {bindReporter} from './lib/bindReporter.js';
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import {getFirstHidden} from './lib/getFirstHidden.js';
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import {initMetric} from './lib/initMetric.js';
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import {observe, PerformanceEntryHandler} from './lib/observe.js';
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import {onHidden} from './lib/onHidden.js';
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import {ReportHandler} from './types.js';
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interface FIDPolyfillCallback {
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(value: number, event: Event): void;
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}
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interface FIDPolyfill {
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onFirstInputDelay: (onReport: FIDPolyfillCallback) => void;
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}
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declare global {
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interface Window {
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perfMetrics: FIDPolyfill;
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}
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}
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// https://wicg.github.io/event-timing/#sec-performance-event-timing
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interface PerformanceEventTiming extends PerformanceEntry {
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processingStart: DOMHighResTimeStamp;
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cancelable?: boolean;
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target?: Element;
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}
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export const getFID = (onReport: ReportHandler) => {
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const metric = initMetric('FID');
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const firstHidden = getFirstHidden();
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const entryHandler = (entry: PerformanceEventTiming) => {
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// Only report if the page wasn't hidden prior to the first input.
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if (entry.startTime < firstHidden.timeStamp) {
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metric.value = entry.processingStart - entry.startTime;
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metric.entries.push(entry);
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metric.isFinal = true;
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report();
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}
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};
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const po = observe('first-input', entryHandler as PerformanceEntryHandler);
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const report = bindReporter(onReport, metric, po);
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if (po) {
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onHidden(() => {
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po.takeRecords().map(entryHandler as PerformanceEntryHandler);
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po.disconnect();
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}, true);
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} else {
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if (window.perfMetrics && window.perfMetrics.onFirstInputDelay) {
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window.perfMetrics.onFirstInputDelay((value: number, event: Event) => {
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// Only report if the page wasn't hidden prior to the first input.
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if (event.timeStamp < firstHidden.timeStamp) {
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metric.value = value;
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metric.isFinal = true;
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metric.entries = [{
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entryType: 'first-input',
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name: event.type,
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target: event.target,
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cancelable: event.cancelable,
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startTime: event.timeStamp,
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processingStart: event.timeStamp + value,
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} as PerformanceEventTiming];
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report();
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}
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});
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}
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}
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};
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