import type { DemoWatchObservation } from './demoSupervisor.js';
export type DemoWatchHealth = Omit<DemoWatchObservation, 'key'> & {
    schema: 'dharma.demo-watch-health/v1';
    key: string;
    pid: number;
    version: string;
    observedAt: string;
};
export declare function writeDemoWatchHealth(home: string, value: DemoWatchHealth): Promise<void>;
export declare function readDemoWatchHealth(home: string, key: string, expected: {
    pid: number;
    version: string;
    now?: number;
}): Promise<DemoWatchHealth | null>;
export declare function createDemoWatchHealthRecorder(input: {
    home: string;
    pid: number;
    version: string;
    now?: () => number;
    write?: typeof writeDemoWatchHealth;
}): {
    available: (key?: string) => boolean;
    record(observation: DemoWatchObservation): void;
    drain(): Promise<void>;
};
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