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| author | altaf-creator <dev@altafcreator.com> | 2025-11-16 19:08:29 +0800 |
|---|---|---|
| committer | altaf-creator <dev@altafcreator.com> | 2025-11-16 19:08:29 +0800 |
| commit | 434aa8343fdcbb4d5002f934979913c099489bee (patch) | |
| tree | 55bab4ec5a6151be57797d34f61faf5ea744471b /frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts | |
| parent | 893c388d4e99442a36005e5971a87730623f946e (diff) | |
sdk, del
Diffstat (limited to 'frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts')
| -rw-r--r-- | frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts b/frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts deleted file mode 100644 index 52e2bee..0000000 --- a/frontend-old/node_modules/web-vitals/src/attribution/onCLS.ts +++ /dev/null @@ -1,93 +0,0 @@ -/* - * Copyright 2022 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 {getLoadState} from '../lib/getLoadState.js'; -import {getSelector} from '../lib/getSelector.js'; -import {onCLS as unattributedOnCLS} from '../onCLS.js'; -import { - CLSAttribution, - CLSMetric, - CLSMetricWithAttribution, - ReportOpts, -} from '../types.js'; - -const getLargestLayoutShiftEntry = (entries: LayoutShift[]) => { - return entries.reduce((a, b) => (a && a.value > b.value ? a : b)); -}; - -const getLargestLayoutShiftSource = (sources: LayoutShiftAttribution[]) => { - return sources.find((s) => s.node && s.node.nodeType === 1) || sources[0]; -}; - -const attributeCLS = (metric: CLSMetric): CLSMetricWithAttribution => { - // Use an empty object if no other attribution has been set. - let attribution: CLSAttribution = {}; - - if (metric.entries.length) { - const largestEntry = getLargestLayoutShiftEntry(metric.entries); - if (largestEntry && largestEntry.sources && largestEntry.sources.length) { - const largestSource = getLargestLayoutShiftSource(largestEntry.sources); - if (largestSource) { - attribution = { - largestShiftTarget: getSelector(largestSource.node), - largestShiftTime: largestEntry.startTime, - largestShiftValue: largestEntry.value, - largestShiftSource: largestSource, - largestShiftEntry: largestEntry, - loadState: getLoadState(largestEntry.startTime), - }; - } - } - } - - // Use Object.assign to set property to keep tsc happy. - const metricWithAttribution: CLSMetricWithAttribution = Object.assign( - metric, - {attribution}, - ); - return metricWithAttribution; -}; - -/** - * Calculates the [CLS](https://web.dev/articles/cls) value for the current page and - * calls the `callback` function once the value is ready to be reported, along - * with all `layout-shift` performance entries that were used in the metric - * value calculation. The reported value is a `double` (corresponding to a - * [layout shift score](https://web.dev/articles/cls#layout_shift_score)). - * - * If the `reportAllChanges` configuration option is set to `true`, the - * `callback` function will be called as soon as the value is initially - * determined as well as any time the value changes throughout the page - * lifespan. - * - * _**Important:** CLS should be continually monitored for changes throughout - * the entire lifespan of a page—including if the user returns to the page after - * it's been hidden/backgrounded. However, since browsers often [will not fire - * additional callbacks once the user has backgrounded a - * page](https://developer.chrome.com/blog/page-lifecycle-api/#advice-hidden), - * `callback` is always called when the page's visibility state changes to - * hidden. As a result, the `callback` function might be called multiple times - * during the same page load._ - */ -export const onCLS = ( - onReport: (metric: CLSMetricWithAttribution) => void, - opts?: ReportOpts, -) => { - unattributedOnCLS((metric: CLSMetric) => { - const metricWithAttribution = attributeCLS(metric); - onReport(metricWithAttribution); - }, opts); -}; |
