microsoft / microsoft/TypeScript

Suggestion: Support readonly interfaces in `getSuggestedLibFor...`

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Domain: Error Messages Help Wanted Possible Improvement
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描述

### 🔍 Search Terms

readonly target library

### ✅ Viability Checklist

- [x] This wouldn't be a breaking change in existing TypeScript/JavaScript code
- [x] This wouldn't change the runtime behavior of existing JavaScript code
- [x] This could be implemented without emitting different JS based on the types of the expressions
- [x] This isn't a runtime feature (e.g. library functionality, non-ECMAScript syntax with JavaScript output, new syntax sugar for JS, etc.)
- [x] This isn't a request to add a new utility type: https://github.com/microsoft/TypeScript/wiki/No-New-Utility-Types
- [x] This feature would agree with the rest of our Design Goals: https://github.com/Microsoft/TypeScript/wiki/TypeScript-Design-Goals

### ⭐ Suggestion

Read-only variants of ECMAScript interfaces are currently not eligible for script target suggestions. This is most noticeable with `ReadonlyArray`, since this type can arise through syntax rather than by referencing the symbol directly.

```ts
[1,2,3].toReversed();
// ~~~~~~~~~~
// Property 'toReversed' does not exist on type 'number[]'. Do you need to change your target library? Try changing the 'lib' compiler option to 'es2023' or later.

([1,2,3] as const).toReversed();
// ~~~~~~~~~~
// Property 'toReversed' does not exist on type 'readonly [1, 2, 3]'.
```

It would be useful if the suggested lib checks could resolve these in the same way.

### 📃 Motivating Example

As above.

### 💻 Use Cases

N/A

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  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

首先跟踪现有的 getSuggestedLibFor... 检查及其测试,然后比较可变和 readonly 数组表达式的解析方式。使用已报告的 toReversed 示例作为验收用例;完成标准是两种形式都建议适当的目标库,同时不改变运行时行为。

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评估

技术栈
typescript
领域
compilers
Issue 类型
功能
难度
4/5
预计耗时
3-5 天
活跃度
停滞
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基本清楚
新手友好度
48/100

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