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Easily measure performance metrics in JavaScript

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declare global { interface Performance { interactionCount: number; } } /** * Returns the `interactionCount` value using the native API (if available) * or the polyfill estimate in this module. */ export declare const getInteractionCount: () => number; /** * Feature detects native support or initializes the polyfill if needed. */ export declare const initInteractionCountPolyfill: () => void;