import type { DeviceAnchor } from './approval';
export declare class AnchorStore {
    private readonly file;
    private writeChain;
    constructor(dataDir: string);
    load(boatId: string | undefined, pairedAt: string | undefined): DeviceAnchor | null | 'broken';
    set(boatId: string, pairedAt: string, anchor: DeviceAnchor): Promise<void>;
    clear(): Promise<void>;
    flush(): Promise<void>;
    private write;
}