Option to generate types instead of interfaces

[jeffrey-ng]

Is it possible to add an option to generate types instead of interfaces?

aka instead of

export interface Message {
  text: string;
}

we would generate

export type Message = {
  text: string;
}

Our specific use case is to conform with Jsonfiable
https://github.com/sindresorhus/type-fest/blob/main/source/jsonifiable.d.ts

[stephenh]

Huh; kind of a lazy ask, but are you sure interface Message { text: string } doesn't match Jsonfiable? I didn't think that interface Foo vs. type Foo really mattered to the TS type system.

Granted, we have a few asks for "types that are exactly JSON":

#1022

And the existing useJsonWireFormat flag.

I just did a test locally in one of our test files:

    let json: Jsonfiable = simple;

And it seems to work.