/**
 * Very simple cache class that uses the filesystem
 */
export declare class Cache {
    dir: string;
    /**
     * @param baseDir the directory to create the .cache directory in
     * @constructor
     */
    constructor(baseDir?: string);
    /**
     * Gets a value from the cache
     *
     * @param key the cache key to lookup
     * @template R the type of the return value
     * @returns the value for `key` as json or null if key doesn't exist
     */
    get<R>(key: string): Promise<R | void>;
    /**
     * Sets a value to the cache
     *
     * @param key the cache key to set the value at
     * @param value the value to set
     * @template R the type of the value
     */
    set<R>(key: string, val: R): Promise<void>;
    /**
     * Gets the path to a file for a given key
     *
     * @param key the cache key to get the path for
     * @returns the path
     */
    getPath(key: string): string;
    /**
     * Hashes a given key
     *
     * @param key the cache key to hash
     * @returns the hashed key
     */
    private hash;
}