Exported variable ... has or is using name ... from external module ... but cannot be named

[ikibalnyi]

TypeScript Version: 4.1.2
Search Terms:
typescript declaration exported variable
typescript exported variable cannot be named
typescript error exported variable

Code:

// types.ts
export enum Enum {
  LOGIN = "login",
  REGISTER = "register"
}

export type MappWrapped = Partial<{
  [Enum.LOGIN]: null;
  [Enum.REGISTER]: null;
}>;

// foo.ts
import { Enum, MappWrapped } from "./routes";

// error happens, says:
// Exported variable 'Broken2' has or is using name 'Enum' from external module "types.ts" but cannot be named.
export const Broken2 = <R extends Enum>(props: Required<MappWrapped[R]>) => props;

Expected behavior:
Code should not fail with Exported variable ... has or is using name ... from external module ... but cannot be named

Actual behavior:
You use declaration: true or "composite": true.
If you make a file that's exporting a map wrapped in any helper function like Record, Partial etc. which is using enum values as keys.
And then use this type inside another file and wrap it in another similar helper (e.g. Record).
Code fails with Exported variable ... has or is using name ... from external module ... but cannot be named.

Playground Link: https://codesandbox.io/s/serene-andras-gsjqx?file=/src/index.ts

[weswigham]

Dupe #40718 ?

[ikibalnyi]

Yeah, looks same, the error code is different tho