/**
 * Per-vault tier-3 (PIN / quick-resume) state.
 *
 * The hub holds a `PinResumeState`-shaped record in memory, keyed by
 * vault. `enrollUnlock` populates it; `unlockViaPin` consumes it via
 * `@noy-db/on-pin`'s `resumePin`. The cached state is wiped when the
 * idle timer fires or `db.close()` is called.
 *
 * Importantly, this module does NOT depend on `@noy-db/on-pin` — the
 * caller passes the already-built state in. That keeps the hub's
 * `peerDependencies` empty for tier-3 and lets developers swap the
 * primitive (e.g. an OS biometric in place of a PIN).
 *
 * @module
 */
/**
 * Opaque `PinResumeState`-compatible record. Mirrored from
 * `@noy-db/on-pin/PinResumeState`. The hub treats the contents as
 * a black box.
 */
export interface QuickUnlockState {
    readonly _noydb_on_pin: 1;
    readonly salt: string;
    readonly iv: string;
    readonly wrappedKeyring: string;
    readonly expiresAt: string;
    readonly maxAttempts: number;
    attempts: number;
}
/** In-memory store for tier-3 unlock state, keyed by vault. */
export declare class QuickUnlockStore {
    private readonly states;
    private readonly timers;
    /**
     * Register a quick-unlock state for a vault. Replaces any existing
     * state. Schedules an automatic clear when the state's `expiresAt`
     * elapses.
     */
    set(vault: string, state: QuickUnlockState): void;
    /** Read the state for a vault. Returns undefined when none is registered. */
    get(vault: string): QuickUnlockState | undefined;
    /** Drop the state for a vault. Cancels the auto-clear timer. */
    delete(vault: string): void;
    /** Drop every cached state. Called on `db.close()`. */
    clear(): void;
    private clearTimer;
}