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export interface PerformanceEntryHandler {
(entry: PerformanceEntry): void;
}
/**
* Takes a performance entry type and a callback function, and creates a
* `PerformanceObserver` instance that will observe the specified entry type
* with buffering enabled and call the callback _for each entry_.
*
* This function also feature-detects entry support and wraps the logic in a
* try/catch to avoid errors in unsupporting browsers.
*/
export declare const observe: (type: string, callback: PerformanceEntryHandler) => PerformanceObserver | undefined;