How to write a definition file for commonjs module that exports function
commonjs, typescript, typescript-typings, typescript2.0
Solution
I found the solution in typescript docs here: http://www.typescriptlang.org/docs/handbook/declaration-files/templates/module-function-d-ts.html
*~ Note that ES6 modules cannot directly export callable functions.
*~ This file should be imported using the CommonJS-style:
*~ import x = require('someLibrary');
...
export = MyFunction;
declare function MyFunction(): string;
so mu definition file should be:
//commonjs-export-function.d.ts
declare function func(): string;
export = func;
and import with require:
//main.ts
import func = require('./commonjs-export-function');
Problem
I want to use simple commonjs module in typescript, and here are 3 files original lib: ``` //commonjs-export-function.js module.exports = function() { return 'func'; }; ``` definition file: ``` //commonjs-export-function.d.ts declare function func(): string; export = func; ``` typescript program which use it: ``` //main.ts import { func } from './commonjs-function'; console.log(func()); ``` When I run tsc I get this error: ``` tsc main.ts && node main.js main.ts(1,22): error TS2497: Module '"/Users/aleksandar/projects/typescript-playground/commonjs-function"' resolves to a non-module entity and cannot be imported using this construct. ``` here is also already answered question but it doesn't work with typescript 2.0 How to write a typescript definition file for a node module that exports a function?