/// <reference types="node" />
export declare const isBufferLike: (
  value: any
) => value is Buffer | ArrayBuffer | SharedArrayBuffer | DataView;
export declare const toBuffer: (value: any) => Buffer | undefined;
export declare const extendIfDefined: (
  ctx: {
    [key: string]: any;
  },
  options: object
) => void;
export declare const singleTapCallback: <T extends Function>(fn: T) => T;
export declare const callbackWrapper: <T extends Function>(fn: T) => T;