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49 lines
1.6 KiB
49 lines
1.6 KiB
2 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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export const initMetric = (name, value) => {
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const navEntry = getNavigationEntry();
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let navigationType = 'navigate';
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if (getBFCacheRestoreTime() >= 0) {
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navigationType = 'back-forward-cache';
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}
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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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}
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else if (document.wasDiscarded) {
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navigationType = 'restore';
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}
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else if (navEntry.type) {
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navigationType = navEntry.type.replace(/_/g, '-');
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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 = [];
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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',
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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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