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import { FCPReportCallbackWithAttribution, ReportOpts } from '../types.js';
/**
* Calculates the [FCP](https://web.dev/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 declare const onFCP: (onReport: FCPReportCallbackWithAttribution, opts?: ReportOpts) => void;