/**
 * Shared Performance API mock utilities for testing
 */
export declare class MockPerformanceObserver {
    callback: PerformanceObserverCallback;
    constructor(callback: PerformanceObserverCallback);
    observe(): void;
    disconnect(): void;
}
export declare const mockMarks: Map<string, PerformanceMark>;
export declare const mockMeasures: PerformanceMeasure[];
export declare const originalPerformance: Performance;
/**
 * Setup Performance API mock
 * Call this in beforeEach or beforeAll
 */
export declare function setupPerformanceMock(): void;
/**
 * Clear performance mock data
 * Call this in afterEach to reset state between tests
 */
export declare function clearPerformanceMock(): void;
/**
 * Restore original performance object
 * Call this in afterEach or afterAll
 */
export declare function restorePerformance(): void;
