error TS4058: Return type of exported function has or is using name '$SYM' from external module fileA but cannot be named

Bug Report

🔎 Search Terms

cannot be named symbol
TS4058

🕗 Version & Regression Information

• This changed between versions 4.7.4 and 5.2.0-dev.20230710
• This is the behavior in every version I tried, and I reviewed the FAQ for entries about "cannot be named"

⏯ Playground Link

Two files involved, so can't make a playground link

💻 Code

declaration=true

// fileA.ts
export const $SYM = Symbol("$SYM");
export const OBJ = { [$SYM]: 42 };

// fileB.ts
import type { $SYM, OBJ } from "./fileA";
export function func(obj: typeof OBJ, sym: typeof $SYM) {
  return [obj, sym];
}

🙁 Actual behavior

Error: Return type of exported function has or is using name '$SYM' from external module "fileA" but cannot be named.

🙂 Expected behavior

The expectation was that it compiles. Because if I use a string constant literal instead of the symbol, it works.

P.S.
In version 4.7.4 it worked, BUT it worked incorrectly: it generated declarations like function func(obj: { [$SYM]: number }) without actually importing $SYM, so it treated $SYM as a string (I think it was a bug). Now that bug is fixed, but there is still no way to generate declarations for similar situations (and as you can see, importing $SYM explicitly doesn't help).

Commencez par le repro à deux fichiers dans fileA.ts et fileB.ts, en utilisant declaration=true et les versions de TypeScript décrites dans le rapport. Suivez la génération de déclaration pour le type de retour de func exportée et le symbole importé. C’est terminé lorsque le repro se compile et émet des déclarations qui préservent correctement la référence au symbole sans TS4058.