[Typescript]DeclareModule

https://www.typescriptlang.org/docs/handbook/modules.html#ambient-modules

Example for declare node.js "url" & "path" module:

node.d.ts

declare module "url" {
export interface Url {
protocol?: string;
hostname?: string;
pathname?: string;
}
export function parse(
urlStr: string,
parseQueryString?,
slashesDenoteHost?
): Url;
}
declare module "path" {
export function normalize(p: string): string;
export function join(...paths: any[]): string;
export var sep: string;
}

Then we can add below code to the file

///

Then we can import those modules and using it:

///
import * as URL from "url";
// import url = require("url")
let myUrl = URL.parse("https://www.typescriptlang.org");

Shorthand ambient modules

If you don’t want to take the time to write out declarations before using a new module, you can use a shorthand declaration to get started quickly.

declarations.d.ts

declare module "hot-new-module";

All imports from a shorthand module will have the any type.

import x, { y } from "hot-new-module";
x(y);