import type { CallbackActivity } from "../../core/callback-activity.ts";
export interface ActivityWatchdogThresholds {
    diagnosticMs: number;
    unresponsiveMs: number;
    pollMs: number;
}
export interface ActivityWatchdogDiagnostic {
    activity: CallbackActivity | undefined;
    elapsedMs: number;
    level: "blocking" | "unresponsive";
    message: string;
    /**
     * Set when the diagnostic is operational rather than a concrete engine
     * failure: `"watchdog"` for heartbeat-gap reports, `"recovery"` for calm
     * engine replacement status, or `"stderr"` for child diagnostics.
     */
    source?: "watchdog" | "recovery" | "stderr";
}
/**
 * Chat-surface policy for engine diagnostics. Heartbeat-watchdog gaps and
 * engine-recovery status stay internal: the TUI remains responsive and both are
 * operational noise rather than a concrete engine failure. Concrete engine
 * failures (RPC errors, a restart that could not complete) always surface.
 */
export declare function shouldRenderEngineDiagnosticAsChatError(diagnostic: ActivityWatchdogDiagnostic): boolean;
export interface ActivityWatchdogOptions {
    now?: () => number;
    onDiagnostic: (diagnostic: ActivityWatchdogDiagnostic) => void;
    thresholds?: Partial<ActivityWatchdogThresholds>;
}
/**
 * How long the engine may go without a heartbeat before it counts as
 * unresponsive. Shared with EngineHealthController so the watchdog's verdict and
 * the explicit Ctrl+C escape hatch use one seconds-scale threshold, not two.
 */
export declare const ENGINE_UNRESPONSIVE_MS = 1000;
export declare class ActivityWatchdog {
    private readonly now;
    private readonly onDiagnostic;
    private readonly thresholds;
    private lastHeartbeatAt;
    private readonly activities;
    private timer;
    private emittedBlocking;
    private emittedUnresponsive;
    constructor(options: ActivityWatchdogOptions);
    start(): void;
    stop(): void;
    heartbeat(): void;
    activityStarted(activity: CallbackActivity): void;
    activityFinished(activityId: string): void;
    private inspect;
    private emit;
}
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