export interface ProxyServerTiming {
    enabled: boolean;
    startedAt: number;
    phases: Map<string, number>;
}
export declare function shouldEnableProxyServerTiming(): boolean;
export declare function createProxyServerTiming(enabled?: boolean): ProxyServerTiming;
export declare function markProxyServerTimingPhase(timing: ProxyServerTiming, name: string, durationMs?: number): void;
export declare function profileProxyServerTimingPhase<T>(timing: ProxyServerTiming, name: string, fn: () => Promise<T>): Promise<T>;
export declare function withProxyServerTimingHeader(response: Response, timing: ProxyServerTiming, totalMs?: number): Response;
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