import { SessionMetrics } from "./types";
export interface SessionMetricsState extends SessionMetrics {
    pauseCount: number;
    resumeCount: number;
    pausedDurationMs: number;
    errorCount: number;
    fatalErrorCount: number;
    createdAt: number;
    activeSessionStartedAt: number | null;
    activePauseStartedAt: number | null;
    lastEmittedAt: number | null;
}
export declare const createInitialSessionMetrics: (createdAt: number, supported: boolean) => SessionMetricsState;
export declare const resetSessionMetrics: (state: SessionMetricsState, now: number) => SessionMetricsState;
export declare const markSessionReady: (state: SessionMetricsState, now: number) => SessionMetricsState;
export declare const markSessionPause: (state: SessionMetricsState, now: number) => SessionMetricsState;
export declare const markSessionResume: (state: SessionMetricsState, now: number) => SessionMetricsState;
export declare const markSessionError: (state: SessionMetricsState, fatal?: boolean) => SessionMetricsState;
export declare const markSessionStop: (state: SessionMetricsState, now: number) => SessionMetricsState;
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