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authoraltaf-creator <dev@altafcreator.com>2025-11-09 11:15:19 +0800
committeraltaf-creator <dev@altafcreator.com>2025-11-09 11:15:19 +0800
commit8eff962cab608341a6f2fedc640a0e32d96f26e2 (patch)
tree05534d1a720ddc3691d346c69b4972555820a061 /frontend-old/node_modules/web-vitals/dist/modules/onFID.js
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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 { getVisibilityWatcher } from './lib/getVisibilityWatcher.js';
+import { initMetric } from './lib/initMetric.js';
+import { observe } from './lib/observe.js';
+import { onHidden } from './lib/onHidden.js';
+import { firstInputPolyfill, resetFirstInputPolyfill, } from './lib/polyfills/firstInputPolyfill.js';
+import { runOnce } from './lib/runOnce.js';
+import { whenActivated } from './lib/whenActivated.js';
+/** Thresholds for FID. See https://web.dev/articles/fid#what_is_a_good_fid_score */
+export const FIDThresholds = [100, 300];
+/**
+ * Calculates the [FID](https://web.dev/articles/fid) value for the current page and
+ * calls the `callback` function once the value is ready, along with the
+ * relevant `first-input` performance entry used to determine the value. The
+ * reported value is a `DOMHighResTimeStamp`.
+ *
+ * _**Important:** since FID is only reported after the user interacts with the
+ * page, it's possible that it will not be reported for some page loads._
+ */
+export const onFID = (onReport, opts) => {
+ // Set defaults
+ opts = opts || {};
+ whenActivated(() => {
+ const visibilityWatcher = getVisibilityWatcher();
+ let metric = initMetric('FID');
+ let report;
+ const handleEntry = (entry) => {
+ // Only report if the page wasn't hidden prior to the first input.
+ if (entry.startTime < visibilityWatcher.firstHiddenTime) {
+ metric.value = entry.processingStart - entry.startTime;
+ metric.entries.push(entry);
+ report(true);
+ }
+ };
+ const handleEntries = (entries) => {
+ entries.forEach(handleEntry);
+ };
+ const po = observe('first-input', handleEntries);
+ report = bindReporter(onReport, metric, FIDThresholds, opts.reportAllChanges);
+ if (po) {
+ onHidden(runOnce(() => {
+ handleEntries(po.takeRecords());
+ po.disconnect();
+ }));
+ onBFCacheRestore(() => {
+ metric = initMetric('FID');
+ report = bindReporter(onReport, metric, FIDThresholds, opts.reportAllChanges);
+ // Browsers don't re-emit FID on bfcache restore so fake it until you make it
+ resetFirstInputPolyfill();
+ firstInputPolyfill(handleEntry);
+ });
+ }
+ });
+};