microsoft / microsoft/TypeScript
Crash: TypeError: Cannot read properties of undefined (reading 'aliasSymbol') remains when using variadic tuple with (infer C)[] and constrained infer
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描述
### 🔎 Search Terms
aliasSymbol, inferFromTypes, variadic tuple, compiler crash
### 🕗 Version & Regression Information
Version: 5.7.3, 5.8.3, 5.9.3,nightly (Still crashing after PR for #63014 )
### ⏯ Playground Link
https://www.typescriptlang.org/zh/play/?target=7&ts=5.9.3#code/C4TwDgpgBAygrgIwCpzAHiQPigXikqCAD2AgDsATAZygG0AoKJqAOjYAoBLMgMwgCcoAYQCUtALoAaRszYtufQQCFCJctToBDMiElRtIcfXFQA-FBUAuKGQgA3AQG56oSPn6cA5p4G5YiFHRaAEY9ACZxTEcgA
### 💻 Code
```ts
type SubTup = T extends [
...(infer C)[],
...infer B extends [any, any]
] ? B : never;
type Trigger = SubTup<[1, 2]>;
```
### 🙁 Actual behavior
```
TypeError: Cannot read properties of undefined (reading 'aliasSymbol')
at inferFromTypes (D:\github\TypeScript\built\local\_tsc.js:68686:18)
at inferFromObjectTypes (D:\github\TypeScript\built\local\_tsc.js:69171:23)
at invokeOnce (D:\github\TypeScript\built\local\_tsc.js:68878:9)
at inferFromTypes (D:\github\TypeScript\built\local\_tsc.js:68840:11)
at inferTypes (D:\github\TypeScript\built\local\_tsc.js:68674:5)
at getConditionalType (D:\github\TypeScript\built\local\_tsc.js:62706:11)
at getConditionalTypeInstantiation (D:\github\TypeScript\built\local\_tsc.js:63695:307)
at instantiateTypeWorker (D:\github\TypeScript\built\local\_tsc.js:63798:14)
at instantiateTypeWithAlias (D:\github\TypeScript\built\local\_tsc.js:63735:20)
at getTypeAliasInstantiation (D:\github\TypeScript\built\local\_tsc.js:60300:52)
Node.js v22.19.0
```
### 🙂 Expected behavior
The compiler should not crash.
### Additional information about the issue
I noticed that while PR #63014 fixed some crashes related to variadic tuples, the compiler still crashes (ICE) when using a slightly different syntax.
贡献指南
从这里开始
- 先读完整个 Issue,再读项目的贡献指南。
- 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
- Fork 仓库,在一个分支上完成修改。
- 提交 Pull Request,并在描述里引用这个 Issue 编号。
调研方向
在 Playground 链接中或编译器内重现 variadic-tuple 代码片段,然后通过 built/local/_tsc.js 跟踪调用栈,尤其关注 inferFromTypes 和 inferFromObjectTypes。将剩余的失败与 PR #63014 进行比较;完成的标准是该示例不再产生 aliasSymbol TypeError,也不再导致编译器崩溃。
由索引模型根据 Issue 内容生成。
评估
- 技术栈
- typescript
- 领域
- compilers
- Issue 类型
- 缺陷
- 难度
- 4/5
- 预计耗时
- 3-5 天
- 活跃度
- 停滞
- 描述清晰度
- 描述清楚
- 新手友好度
- 45/100