/**
 * Simple instrumentation for profiling happy-dom hot paths.
 * Enable by setting HAPPY_DOM_INSTRUMENTATION=1 environment variable.
 */
interface CallStats {
    count: number;
    totalTime: number;
}
/**
 * Wraps a function to track call count and time.
 */
export declare function instrument<T extends (...args: any[]) => any>(name: string, fn: T): T;
/**
 * Increments a counter for a specific operation.
 */
export declare function count(name: string): void;
/**
 * Returns collected stats.
 */
export declare function getStats(): Map<string, CallStats>;
/**
 * Clears all stats.
 */
export declare function clearStats(): void;
/**
 * Prints stats sorted by call count.
 */
export declare function printStats(): void;
/**
 * Writes stats to a JSON file.
 */
export declare function writeStatsToFile(filePath: string): void;
export declare const isEnabled: boolean;
export {};
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