66 lines
2.2 KiB
JavaScript
66 lines
2.2 KiB
JavaScript
Object.defineProperty(exports, '__esModule', { value: true });
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const bindReporter = require('./lib/bindReporter.js');
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const getVisibilityWatcher = require('./lib/getVisibilityWatcher.js');
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const initMetric = require('./lib/initMetric.js');
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const observe = require('./lib/observe.js');
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const onHidden = require('./lib/onHidden.js');
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/*
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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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/**
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* Calculates the [FID](https://web.dev/fid/) value for the current page and
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* calls the `callback` function once the value is ready, along with the
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* relevant `first-input` performance entry used to determine the value. The
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* reported value is a `DOMHighResTimeStamp`.
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*
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* _**Important:** since FID is only reported after the user interacts with the
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* page, it's possible that it will not be reported for some page loads._
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*/
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const onFID = (onReport) => {
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const visibilityWatcher = getVisibilityWatcher.getVisibilityWatcher();
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const metric = initMetric.initMetric('FID');
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// eslint-disable-next-line prefer-const
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let report;
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const handleEntry = (entry) => {
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// Only report if the page wasn't hidden prior to the first input.
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if (entry.startTime < visibilityWatcher.firstHiddenTime) {
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metric.value = entry.processingStart - entry.startTime;
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metric.entries.push(entry);
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report(true);
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}
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};
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const handleEntries = (entries) => {
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(entries ).forEach(handleEntry);
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};
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const po = observe.observe('first-input', handleEntries);
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report = bindReporter.bindReporter(onReport, metric);
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if (po) {
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onHidden.onHidden(() => {
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handleEntries(po.takeRecords() );
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po.disconnect();
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}, true);
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}
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};
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exports.onFID = onFID;
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//# sourceMappingURL=getFID.js.map
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