suppose I have an interface and a generic function
const unused = foo<number>()
declare const a: typeof unused
// a: SimpleRecord<number>[] but a function call will be triggered. If foo has side effects, it will get rid of.
so ask me, how exactly can I achieve type ret < T > = ReturnType < typeof foo < T > ?
declare function foo<T>():T[]; return generics? I think your problem description is a little confused.
just say your input and expected output
interface SimpleRecord<T> { prop: T }
type Foo<T> = () => SimpleRecord<T>[];
declare function foo<T>(): ReturnType<Foo<T>>;
let a: ReturnType<Foo<string>>;
//a: SimpleRecord<string>[]I don't know if this is what you want
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