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onTTFB.d.ts1.02 kB
import { TTFBMetricWithAttribution, ReportOpts } from '../types.js'; /** * Calculates the [TTFB](https://web.dev/articles/ttfb) value for the * current page and calls the `callback` function once the page has loaded, * along with the relevant `navigation` performance entry used to determine the * value. The reported value is a `DOMHighResTimeStamp`. * * Note, this function waits until after the page is loaded to call `callback` * in order to ensure all properties of the `navigation` entry are populated. * This is useful if you want to report on other metrics exposed by the * [Navigation Timing API](https://w3c.github.io/navigation-timing/). For * example, the TTFB metric starts from the page's [time * origin](https://www.w3.org/TR/hr-time-2/#sec-time-origin), which means it * includes time spent on DNS lookup, connection negotiation, network latency, * and server processing time. */ export declare const onTTFB: (onReport: (metric: TTFBMetricWithAttribution) => void, opts?: ReportOpts) => void;

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