oxc-project__oxc/crates/oxc_isolated_declarations/tests/fixtures/enum-runtime-initializer.ts at codex/parser-grouped-expression-allocation - oxc-project__oxc - GetSkill.work

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camc314 8c936018d1 fix(isolated-declarations): allow unknown enum initializer in non-const enum (#22900 )

Fixes an isolated declarations diagnostic mismatch for enum initializers.

TypeScript allows runtime enum initializers under `--isolatedDeclarations` for regular enums and emits the declaration without initializer values:

[TS playground](https://www.typescriptlang.org/play/?isolatedDeclarations=true#code/KYDwDg9gTgLgBMAdgVwLZwEIEMAmBRFdAbwCg44BBOAXjgFksYALAOii0RwlQAoBKADRlMNSnADUcAIxCAviRKhIsOAGMIiAM7wkaTLgDCG7QT2lyVWg2ZsOXXoOEZRVSTJLygA)

```ts
export enum BadEnum {
  A = Math.random(),
  B = A + 1,
}
```

```ts
export declare enum BadEnum {
  A,
  B
}
```

Oxc already emitted the same declaration shape, but also reported TS9020. This PR narrows that diagnostic behavior so regular enum runtime initializers are omitted without an isolated declarations error.

For `const enum`, TypeScript still reports `TS2474` because const enum initializers must be constant expressions:

[TS playground](https://www.typescriptlang.org/play/?isolatedDeclarations=true#code/KYDwDg9gTgLgBMAdgVwLZwEIEMAmBRFdAbwCg44BBOAXjgFksYALAOii0RwlQAoBKADRlMNSnADUcAIxCAviRKhIsOAGMIiAM7wkaTLgDCG7QT2lyVWg2ZsOXXoOEZRVSTJLygA)

```ts
export const enum BadConstEnum {
  A = Math.random(),
  B = A + 1,
}
```

This PR keeps that error behavior aligned by reporting `TS2474` for non-constant `const enum` initializers.

2026-06-03 02:37:22 +00:00

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TypeScript

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 export enum BadEnum {
   A = Math.random(),
   B = A + 1,
 }
 export const enum BadConstEnum {
   A = Math.random(),
   B = A + 1,
 }