/**
 * Runtime-safe monotonic clock for profiling.
 * Priority: performance.now > process.hrtime > Date.now
 */
export type ClockSource = "performance" | "hrtime" | "date";
export declare function getClockSource(): ClockSource;
export declare function isMonotonic(): boolean;
export declare function nowMs(): number;
export declare function measureAsync<T>(fn: () => Promise<T>): Promise<[T, number]>;
export declare function measureSync<T>(fn: () => T): [T, number];
export declare function generateProfileId(): string;
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