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authoraltaf-creator <dev@altafcreator.com>2025-11-16 19:08:29 +0800
committeraltaf-creator <dev@altafcreator.com>2025-11-16 19:08:29 +0800
commit434aa8343fdcbb4d5002f934979913c099489bee (patch)
tree55bab4ec5a6151be57797d34f61faf5ea744471b /frontend-old/node_modules/web-vitals/src/onFCP.ts
parent893c388d4e99442a36005e5971a87730623f946e (diff)
sdk, del
Diffstat (limited to 'frontend-old/node_modules/web-vitals/src/onFCP.ts')
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diff --git a/frontend-old/node_modules/web-vitals/src/onFCP.ts b/frontend-old/node_modules/web-vitals/src/onFCP.ts
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--- a/frontend-old/node_modules/web-vitals/src/onFCP.ts
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-/*
- * Copyright 2020 Google LLC
- *
- * Licensed under the Apache License, Version 2.0 (the "License");
- * you may not use this file except in compliance with the License.
- * You may obtain a copy of the License at
- *
- * https://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS,
- * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
- * See the License for the specific language governing permissions and
- * limitations under the License.
- */
-
-import {onBFCacheRestore} from './lib/bfcache.js';
-import {bindReporter} from './lib/bindReporter.js';
-import {doubleRAF} from './lib/doubleRAF.js';
-import {getActivationStart} from './lib/getActivationStart.js';
-import {getVisibilityWatcher} from './lib/getVisibilityWatcher.js';
-import {initMetric} from './lib/initMetric.js';
-import {observe} from './lib/observe.js';
-import {whenActivated} from './lib/whenActivated.js';
-import {FCPMetric, MetricRatingThresholds, ReportOpts} from './types.js';
-
-/** Thresholds for FCP. See https://web.dev/articles/fcp#what_is_a_good_fcp_score */
-export const FCPThresholds: MetricRatingThresholds = [1800, 3000];
-
-/**
- * Calculates the [FCP](https://web.dev/articles/fcp) value for the current page and
- * calls the `callback` function once the value is ready, along with the
- * relevant `paint` performance entry used to determine the value. The reported
- * value is a `DOMHighResTimeStamp`.
- */
-export const onFCP = (
- onReport: (metric: FCPMetric) => void,
- opts?: ReportOpts,
-) => {
- // Set defaults
- opts = opts || {};
-
- whenActivated(() => {
- const visibilityWatcher = getVisibilityWatcher();
- let metric = initMetric('FCP');
- let report: ReturnType<typeof bindReporter>;
-
- const handleEntries = (entries: FCPMetric['entries']) => {
- entries.forEach((entry) => {
- if (entry.name === 'first-contentful-paint') {
- po!.disconnect();
-
- // Only report if the page wasn't hidden prior to the first paint.
- if (entry.startTime < visibilityWatcher.firstHiddenTime) {
- // The activationStart reference is used because FCP should be
- // relative to page activation rather than navigation start if the
- // page was prerendered. But in cases where `activationStart` occurs
- // after the FCP, this time should be clamped at 0.
- metric.value = Math.max(entry.startTime - getActivationStart(), 0);
- metric.entries.push(entry);
- report(true);
- }
- }
- });
- };
-
- const po = observe('paint', handleEntries);
-
- if (po) {
- report = bindReporter(
- onReport,
- metric,
- FCPThresholds,
- opts!.reportAllChanges,
- );
-
- // Only report after a bfcache restore if the `PerformanceObserver`
- // successfully registered or the `paint` entry exists.
- onBFCacheRestore((event) => {
- metric = initMetric('FCP');
- report = bindReporter(
- onReport,
- metric,
- FCPThresholds,
- opts!.reportAllChanges,
- );
-
- doubleRAF(() => {
- metric.value = performance.now() - event.timeStamp;
- report(true);
- });
- });
- }
- });
-};