Typescript 2.0 Namespaces file is not a module

Question

I'm using TypeScript 2.1.0 and VS Code 1.3 and I'm trying to get used to the module/namespace system in TypeScript 2. I have a file validators.ts

namespace Validator{
  export interface String{
    isValid(s:string):boolean;
  }
}
declare module 'validator'{
  export = Validator;
}

And when I try to use it like import {Validator} from "../validators/validators";

I get the error validators.ts is not a module.
I'm installing my external types with npm i @types/myTypes and after installing bluebird and copying its structure I'm still seeing this error. Is this a VS Code bug, or a me bug?

Mattias Buelens · Accepted Answer · 2016-08-02 22:06:40Z

6

It's much simpler:

export namespace Validator{
  export interface String{
    isValid(s:string):boolean;
  }
}

You should use declare module only when writing type definitions for external libraries. For your own TypeScript code, use regular ES6 style import and export syntax.

answered Aug 2, 2016 at 22:06

Mattias Buelens

20.2k4 gold badges47 silver badges52 bronze badges

Sign up to request clarification or add additional context in comments.

7 Comments

Mega Man Over a year ago

how can I properly import this interface? import {String} from "../validators/validators"; as no exported member String if I do import * as S from "../validators/validators"; I don't see the String interface available through intellisense.

Mattias Buelens Over a year ago

If you don't need the wrapping Validator namespace, just get rid of it by removing the first and last line from my code snippet.

Mega Man Over a year ago

I'm most interested in exporting multiple interfaces in the same file. is there a good way to export multiple interfaces from the same file?

Mattias Buelens Over a year ago

Sure, just add multiple exports in the same file! export interface A {...} export interface B {...} You don't really need namespaces when you're going to use ES6 modules.

Mega Man Over a year ago

thanks for the heads up. I'm unsure when VS Code has a bug and when I've gotten the wrong TypeScript syntax. +1

|

Collectives™ on Stack Overflow

Typescript 2.0 Namespaces file is not a module

1 Answer 1

7 Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

1 Answer 1

7 Comments

Your Answer

Sign up or log in

Post as a guest

Related