type MeasurementKey = string;
export declare function now(): number;
export declare function measure(key: MeasurementKey): number;
export declare function endMeasure(key: MeasurementKey, options?: {
    displayName?: string;
    lastTime?: number;
    silent?: boolean;
}): number;
/**
 * Get the cumulative of a specific measurement by prefix. If you had for example these measurements:
 * - transpile-index.js
 * - transpile-test.js
 *
 * You can get the sum of these measurements with getCumulativeMeasure('transpile', 'Transpilation')
 */
export declare function getCumulativeMeasure(prefix: string, options?: {
    displayName?: string;
    silent?: boolean;
}): number;
export declare function clearMeasurements(): void;
export declare function getMeasurements(): {
    [measurement: string]: number;
};
export declare function persistMeasurements(data: {
    sandboxId: string;
    cacheUsed: boolean;
    browser: string;
    version: string;
}): Promise<Response | void>;
export {};