import { AttemptTimings } from '../createEmptyAttemptTimings';
export type WebViewLoadPhaseDurations = {
    htmlLoadMs: number | null;
    manifestReceivedMs: number | null;
    onLoadToOnLoadEndMs: number | null;
    sdkReadyMs: number | null;
};
/**
 * Per-phase durations of the current load attempt, for the timing meta on
 * telemetry and terminal errors. A duration is null until both of its
 * boundary events have been observed.
 */
export declare const getPhaseDurations: (timings: AttemptTimings) => WebViewLoadPhaseDurations;