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import { LCPMetric, MetricRatingThresholds, ReportOpts } from './types.js';
/** Thresholds for LCP. See https://web.dev/articles/lcp#what_is_a_good_lcp_score */
export declare const LCPThresholds: MetricRatingThresholds;
/**
* Calculates the [LCP](https://web.dev/articles/lcp) value for the current page and
* calls the `callback` function once the value is ready (along with the
* relevant `largest-contentful-paint` performance entry used to determine the
* value). The reported value is a `DOMHighResTimeStamp`.
*
* If the `reportAllChanges` configuration option is set to `true`, the
* `callback` function will be called any time a new `largest-contentful-paint`
* performance entry is dispatched, or once the final value of the metric has
* been determined.
*/
export declare const onLCP: (onReport: (metric: LCPMetric) => void, opts?: ReportOpts) => void;
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