import { Config } from 'cli-engine-config';
export declare class Lock {
    config: Config;
    lockfile: string;
    constructor(config: Config, lockfile?: string);
    read(): Promise<any>;
    unread(): Promise<void>;
    canRead(): Promise<boolean>;
    write(): Promise<() => Promise<any>>;
    upgrade(): Promise<() => Promise<any>>;
}