How to declare and import typescript interfaces in a separate file

Question

I want to define several interfaces in their own file in my typescript-based project, from which I\'ll implement classes for production as well as mocks for testing. However

Answer 1

You need to export the interfaces in the file the are defined in and import them in the files they are used in. See this link for examples.

x.ts

interface X{
    ...
}
export default X

y.ts

import X from "./x.ts"
// You can use X now

For more information see https://www.typescriptlang.org/docs/handbook/modules.html