/**
 * Measure and log result.
 * @param fn - function to measure.
 * @param message - message to log
 * @param callback - called when the function has finished.
 * @returns a function
 */
export declare function perfFn<P extends any[], R>(fn: (...args: P) => R, message: string, callback?: (m: string, elapsedMs: number) => void): (...args: P) => R;
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