Equivalent of module.exports in Typescript Declaration file

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.';

You must use this syntax in the case of export =:

import Library = require("library");

More about it here: export = and import = require()

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