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58 lines
1.9 KiB
58 lines
1.9 KiB
3 months ago
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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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import {getBFCacheRestoreTime} from './bfcache.js';
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import {generateUniqueID} from './generateUniqueID.js';
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import {getActivationStart} from './getActivationStart.js';
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import {getNavigationEntry} from './getNavigationEntry.js';
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import {MetricType} from '../types.js';
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export const initMetric = <MetricName extends MetricType['name']>(
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name: MetricName,
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value?: number
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) => {
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const navEntry = getNavigationEntry();
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let navigationType: MetricType['navigationType'] = 'navigate';
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if (getBFCacheRestoreTime() >= 0) {
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navigationType = 'back-forward-cache';
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} else if (navEntry) {
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if (document.prerendering || getActivationStart() > 0) {
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navigationType = 'prerender';
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} else if (document.wasDiscarded) {
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navigationType = 'restore';
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} else if (navEntry.type) {
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navigationType = navEntry.type.replace(
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/_/g,
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'-'
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) as MetricType['navigationType'];
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}
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}
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// Use `entries` type specific for the metric.
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const entries: Extract<MetricType, {name: MetricName}>['entries'] = [];
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return {
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name,
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value: typeof value === 'undefined' ? -1 : value,
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rating: 'good' as const, // If needed, will be updated when reported. `const` to keep the type from widening to `string`.
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delta: 0,
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entries,
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id: generateUniqueID(),
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navigationType,
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};
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};
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