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web-vitals

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Easily measure performance metrics in JavaScript

github.com/GoogleChrome/web-vitals

GoogleChrome/web-vitals

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import { FirstInputPolyfillCallback } from '../../types.js'; /** * Accepts a callback to be invoked once the first input delay and event * are known. */ export declare const firstInputPolyfill: (onFirstInput: FirstInputPolyfillCallback) => void; export declare const resetFirstInputPolyfill: () => void;