An interface cannot be exported in an angular 2 module?

Question

I tried to export an interface in a NgModule-declaration and export and getting this error already in the editor (Visual Studio Code): [ts] \'MyInterface\' only refers

Answer 1

You cannot export an interface. You can only export:

1. Other modules
2. Components
3. Directives
4. Pipes

NgModule is an angular concept and should not be confused with a typescript module. To make a third party, who uses your module, able to use your interface, you should create a .d.ts definition file with your module.

If you want to use a interface inside another NgModule of yours, you should just use:

import {InterfaceName} from 'path/to/ngmodule/to/interface';

Also, do not put an interface in the declarations array, this is only used for pipes/components/directives.

If you want your interface to be usable outside of an library, you should add it to the export of your index.ts:

export {InterfaceName} from 'path/to/ngmodule/to/interface';