export interface RequestProfileRecord {
    sequence: number;
    category: string;
    method: string;
    pathname: string;
    projectSlug?: string;
    requestMode?: string;
    status?: number;
    startedAt: string;
    completedAt: string;
    totalMs: number;
    phases: Record<string, number>;
}
export interface RequestProfileContextUpdate {
    projectSlug?: string;
    requestMode?: string;
}
/** Round to 2 decimal places (Server-Timing millisecond precision). */
export declare function roundMs(value: number): number;
export declare function isRequestProfilingEnabled(pathname?: string): boolean;
export declare function runWithRequestProfiling<T>(options: {
    category: string;
    method: string;
    pathname: string;
    projectSlug?: string;
    requestMode?: string;
}, fn: () => Promise<T>): Promise<T>;
export declare function profilePhase<T>(name: string, fn: () => Promise<T>): Promise<T>;
export declare function markRequestProfilePhase(name: string, durationMs?: number): void;
export declare function profileSyncPhase<T>(name: string, fn: () => T): T;
export declare function updateRequestProfileContext(update: RequestProfileContextUpdate): void;
export declare function finalizeRequestProfiling(status?: number): RequestProfileRecord | null;
/** Build a Server-Timing header value from a total plus named phase durations. */
export declare function buildServerTimingValue(totalLabel: string, totalMs: number, phases: Iterable<[string, number]>): string;
export declare function buildServerTimingHeader(record: RequestProfileRecord): string;
export declare function withServerTimingHeader(response: Response, record: RequestProfileRecord | null): Response;
export declare function snapshotRequestProfiles(): {
    enabled: boolean;
    last_sequence: number;
    records: RequestProfileRecord[];
};
export declare function resetRequestProfiles(): void;
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