/**
 * The install mutex is per-machine (staleness is judged by pid + hostname), so it lives in the OS
 * temp dir keyed by the project root — never inside the project, where it could leak into packs
 * or version control.
 */
export declare function projectInstallLockPath(projectRoot: string): string;
export interface ProjectInstallLockOptions {
    timeoutMs?: number;
    retryDelayMs?: number;
    staleMs?: number;
}
export declare function withProjectInstallLock<T>(projectRoot: string, task: () => Promise<T>, options?: ProjectInstallLockOptions): Promise<T>;
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