Microsoft/TypeScript
Ver no GitHuberror TS4058: Return type of exported function has or is using name '$SYM' from external module fileA but cannot be named
Open
#54.964 aberto em 11 de jul. de 2023
Domain: Declaration EmitHelp WantedPossible Improvement
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Description
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).