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web-vitals

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Easily measure performance metrics in JavaScript

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import type { MetricType } from '../types.js'; export declare const initMetric: <MetricName extends MetricType["name"]>(name: MetricName, value?: number, navigationType?: MetricType["navigationType"], navigationId?: number, navigationInteractionId?: number, navigationURL?: string, navigationStartTime?: number) => { name: MetricName; value: number; rating: "good"; delta: number; entries: (Extract<import("../types.js").CLSMetric, { name: MetricName; }> | Extract<import("../types.js").FCPMetric, { name: MetricName; }> | Extract<import("../types.js").INPMetric, { name: MetricName; }> | Extract<import("../types.js").LCPMetric, { name: MetricName; }> | Extract<import("../types.js").TTFBMetric, { name: MetricName; }>)["entries"]; id: string; navigationType: "navigate" | "reload" | "back-forward" | "back-forward-cache" | "prerender" | "restore" | "soft-navigation"; navigationId: number; navigationInteractionId: number | undefined; navigationURL: string | undefined; navigationStartTime: number; };