import { URL } from "url";
import { ObjectSource, PlainSource, Source, TupleSource } from "../_types";
declare export var isString: (x: Source | void | null) => boolean;
declare export var isBuffer: (x: Source | void | null) => boolean;
declare export var isStream: (x: Source | void | null) => boolean;
declare export var isURL: (x: Source | void | null) => boolean;
declare export var isFileUri: (x: Source | void | null) => boolean;
declare export var isPlain: (x: Source | void | null) => boolean;
declare export var isTuple: (
  x: { [key: string]: any } | void | null
) => boolean;
declare export var isObject: (x: Source | void | null) => boolean;
declare export var isIterable: (x: Source | void | null) => boolean;
declare export var isFileName: (x: Source | void | null) => boolean;