import { Exception } from '@microsoft.azure/tasks';
export declare class UnableToReadLockException extends Exception {
    exitCode: number;
    constructor(path: string, exitCode?: number);
}
export interface UnlockOptions {
    realpath?: boolean;
    delay?: number;
}
export interface CheckOptions extends UnlockOptions {
    stale?: number;
}
export interface LockOptions extends CheckOptions {
    update?: number;
    retries?: number;
}
export declare type release = () => Promise<void>;
export declare type _release = () => void;
export declare class Lock {
    private static _exclusive;
    static check: (path: string, options?: CheckOptions) => Promise<boolean>;
    static exclusive(path: string, options?: LockOptions): Promise<release>;
    static waitForExclusive(path: string, timeout?: number): Promise<release | null>;
    static read(path: string, options?: LockOptions): Promise<release>;
}