create-react-app with typescript - how to put types in separate file

Question

I'm using CRA with typescript (create-react-app myapp --typescript)

I have some typescript stuff in my App.tsx that I would like to store externally, and I've tried creating App.d.ts, index.d.ts, module.d.ts and none of it works.

Here's the interface I'm using:

declare interface IArgs {
    home: string,
    away: string
}

What do I need to do to be able to declare all my Typescript stuff in a file that my source files can share?

Answer 1

Put in external file eg. interfaces/interfaces.ts:

export interface IArgs {
    home: string,
    away: string
}

Then in App.tsx where you want to use it you import it by: import { IArgs } from 'interfaces/interfaces'; and use it for your needs.