export declare function runDemoWatch<T extends {
    stage: string;
    sourceSync?: {
        state: string;
    };
}>(input: {
    cycle: () => Promise<T>;
    intervalMs?: number;
    once?: boolean;
    signal?: AbortSignal;
    onCycle?: (result: T) => void;
    onFailure?: (code: string) => void;
}): Promise<{
    ok: boolean;
    stage: string;
    cycles: number;
    failures: number;
    lastStage: string | null;
    lastSourceState: string | null;
    lastFailureCode: string | null;
}>;
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