/**
 * Health check state and vector backend monitor for iranti's API server.
 *
 * Provides lightweight, side-effect-free helpers used by `server.ts` to
 * build and maintain the `/health` response:
 *
 *  - `createHealthCheckState(initial)` — factory for a mutable `HealthCheckState`
 *    object that `server.ts` updates as probes complete
 *  - `deriveOperatorStatus(context)` — computes `'ok' | 'degraded'` from the
 *    combination of runtime authority source, metadata health, and vector backend
 *    health; degraded when any critical check has failed
 *  - `createVectorBackendMonitor(options)` — starts an interval-based probe loop
 *    against the vector backend's `ping()`. Updates a shared `HealthCheckState`
 *    on each probe result and calls `logError` on failure. Returns `{ probe,
 *    start, stop }` so the server can control the monitor lifecycle.
 *
 * Designed for testability: `setIntervalImpl` / `clearIntervalImpl` overrides
 * allow tests to inject fake timers without patching globals.
 */
export type HealthCheckState = {
    checked: boolean;
    ok: boolean;
    detail: string;
};
export type OperatorStatusContext = {
    runtimeAuthoritySource: 'env' | 'instance' | 'workspace' | 'invalid' | string;
    runtimeMetadataHealth: HealthCheckState;
    vectorBackendHealth: HealthCheckState;
};
export type ProbeContext = 'startup' | 'interval';
type IntervalHandle = ReturnType<typeof setInterval>;
type VectorBackendMonitorOptions = {
    ping: () => Promise<boolean>;
    intervalMs?: number;
    logError?: (message: string) => void;
    setIntervalImpl?: typeof setInterval;
    clearIntervalImpl?: typeof clearInterval;
};
export declare function createHealthCheckState(initial: HealthCheckState): HealthCheckState;
export declare function deriveOperatorStatus(context: OperatorStatusContext): 'ok' | 'degraded';
export declare function createVectorBackendMonitor(options: VectorBackendMonitorOptions): {
    state: HealthCheckState;
    probe: (context: ProbeContext) => Promise<void>;
    start: () => IntervalHandle;
    stop: () => void;
};
export {};
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