export declare function promisify<T>(func: (callback: (err: any, result: T) => void) => void): () => Promise<T>;
export declare function promisify<T, A1>(func: (arg1: A1, callback: (err: any, result: T) => void) => void): (arg1: A1) => Promise<T>;
export declare function promisify<T, A1, A2>(func: (arg1: A1, arg2: A2, callback: (err: any, result: T) => void) => void): (arg1: A1, arg2: A2) => Promise<T>;