Equivalent of module.exports in Typescript Declaration file

Question

I try to do the declaration file of a library.

In the library.js file there is:

if (typeof module !== 'undefined' /* && !!module.exports*/) {
    module.exports = Library;
}

What should I put in my library.d.ts file to be able to import and use this library in my code?

I expect to be able to do:

import { Library } from 'library';
const instance = new Library();

Answer 1

You need to use the special export = and import Library = require syntax, as pointed out by @Nitzan:

export = and import = require()

---

A complete example:

node_modules/library/index.js

module.exports = function(arg) {
  return 'Hello, ' + arg + '.';
}

library.d.ts This filename technically does not matter, only the .d.ts extension.

declare module "library" {
  export = function(arg: string): string;
}

source.ts

import Library = require('library');

Library('world') == 'Hello, world.';