How do you export an interface into global namespace – angular

I have a file with defined interfaces I’d like to share with my app’s global namespace. My first attempt to do this was that I imported the interfaces.ts file into my app.module.ts and placed the interface into the exports array, but types/interfaces cannot be used in this way, so I thought of a few questions related to this small issue.

Does app.module.ts need to be involved for exporting to the global namespaces?

Is there a different way to do it (probably a native javascript way)?

If app.module.ts is required to do this, how do I import an interface in a way that my app.module.ts shares it with the rest of my app, so that I wont have to constantly import it in my components?

Source: Angular Questions