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14 lines
745 B
14 lines
745 B
2 months ago
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import { FIDReportCallback, MetricRatingThresholds, ReportOpts } from './types.js';
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/** Thresholds for FID. See https://web.dev/fid/#what-is-a-good-fid-score */
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export declare const FIDThresholds: MetricRatingThresholds;
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/**
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* Calculates the [FID](https://web.dev/fid/) value for the current page and
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* calls the `callback` function once the value is ready, along with the
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* relevant `first-input` performance entry used to determine the value. The
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* reported value is a `DOMHighResTimeStamp`.
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*
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* _**Important:** since FID is only reported after the user interacts with the
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* page, it's possible that it will not be reported for some page loads._
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*/
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export declare const onFID: (onReport: FIDReportCallback, opts?: ReportOpts) => void;
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