/** Collects only results used by this build in the output directory. */
export declare class BuildCacheStore<T> {
    private readonly output;
    private readonly restored;
    constructor({ restoredRoot, outputRoot }: {
        restoredRoot: string;
        outputRoot: string;
    });
    get(key: Buffer): Promise<T | null | undefined>;
    set(key: Buffer, value: T): Promise<void>;
    clear(): void;
}