[TypeScript] Utility type for getting the ResultType from a query function

[italodeandra]

Actual question

Is there a utility type or a do someone have any suggestions for me to be able to get the ResultType from a query function?

I got to this type already:

ReturnType<Model<User>[Method]>

and this actually translates to

Query<(User & Document<any, any>)[], User & Document<any, any>, {}>

How do I get only the ResultType which is the (User & Document<any, any>)[] part of it?

Small introduction

Hi team,

I'm building an extension of Mongoose which will transform the models you create into API's to be consumed on the frontend (just very oversimplified explanation of what it actually is).

The problem of making something in that scale, is that typings are complicated, so that's why I need to make this utility and I'm having some trouble.

[italodeandra]

I created this utility type which gets the thenable result

type Await<T> = T extends {
  then(onfulfilled?: (value: infer U) => unknown): unknown
}
  ? U
  : T

So this type get's exactly what I want: Await<ReturnType<Model<User>[Method]>>.

[vkarpov15]

Yep infer is the way to go 👍