diff options
Diffstat (limited to 'frontend-old/node_modules/web-vitals/dist/modules/onFID.js')
| -rw-r--r-- | frontend-old/node_modules/web-vitals/dist/modules/onFID.js | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/frontend-old/node_modules/web-vitals/dist/modules/onFID.js b/frontend-old/node_modules/web-vitals/dist/modules/onFID.js new file mode 100644 index 0000000..c656b58 --- /dev/null +++ b/frontend-old/node_modules/web-vitals/dist/modules/onFID.js @@ -0,0 +1,70 @@ +/* + * 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); + }); + } + }); +}; |
