microsoft / microsoft/TypeScript
Inconsistent enum literal types
Nobody has claimed this yet.
- Dominant language
- Go
- Stars
- 111k
- Forks
- 14.3k
- Avg merge
- 2d 4h
- Merged PRs (30d)
- 132
Description
### 🔎 Search Terms
return type inference enum union literal fresh regular
### 🕗 Version & Regression Information
- This is the behavior in every version I tried
### ⏯ Playground Link
https://www.typescriptlang.org/play/?ts=5.8.0-dev.20250216#code/KYOwrgtgBAolDeUCCAaKAhKBfAUDgLgJ4AOwGA9gB4A8AKgHxQC8COUUA5sPgFxQAUASmaNaAbjZQAztz78AbgEMANmGB9awpo3nkAlgBMJWCTgPAAxssUAnMgDMwIC-j3kQUAEZU69BSrUNQT50HwZTC3cpfC8QAEZmLyp+AAZBMSgAekyKGnAIT2AbehxIkGjYgCYQn3zC4sTvSlT0rJyAeQBrPDKKwoSWJv4YADokVuzc6hgS3pjC6qmZxuTR8YzJmBsbchs0JumxxhByGMUpKT0OEEVPZTJ8ciWSoA
### 💻 Code
```ts
enum E { A, B }
type Box = {
get: () => T;
set: (value: T) => void;
};
declare function box(value: T): Box;
const bn1 = box(0); // Box
const bn2: Box = box(0); // Ok
const be1 = box(E.A); // Box
const be2: Box = box(E.A); // Error, box not assignable to Box
```
### 🙁 Actual behavior
`be2` errors
### 🙂 Expected behavior
`be2` shouldn't error
### Additional information about the issue
This is an enum-based variant of https://github.com/microsoft/TypeScript/issues/48363 . As such it relates to the open https://github.com/microsoft/TypeScript/issues/59754 too
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start with the linked TypeScript Playground reproduction and compare the inferred types of bn1, bn2, be1, and be2. Read the related issues #48363 and #59754 for existing context; done means the enum-based be2 assignment no longer errors while preserving the expected inference behavior.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- typescript
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100