CODEWITHSUNDEEP
javascripttypescript
Yoann Augen
Yoann Augen

Reputation: 2036

Typescript declaration file is not a module

I try to create a typescript declaration file for a sample JS library

my_lib.js : 

function f1(a, b) {
  return a + b;
} 
function f2(a, b) {
  return a - b;
}  
module.exports = {
  f1: f1,
  f2: f2 
}

my_lib.d.ts

declare module 'my_lib' {
    function f1(a: number, b: number): number;
    function f2(a: number, b: number): number;   
    export default {
        f1: f1,
        f2: f2 
    }
}

A typescript file try to used the library with

import my_lib from 'my_lib';

I have this error

error TS2656: Exported external package typings file 'C:/.../my_lib.d.ts' is not a module. Please contact the package author to update the package definition.

Any idea? Thanks

Upvotes: 0

Views: 2646

Answers (2)

Yoann Augen
Yoann Augen

Reputation: 2036

I solved using export = and import my_lib = require("my_lib"); syntax

Upvotes: 1

Yahiko
Yahiko

Reputation: 188

lib.d.ts is a reserved filename for TypeScript internal library. Do not use it.

Upvotes: 1

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