microsoft / microsoft/TypeScript

ESM strict imports mode option to moduleResolution bundler

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描述

### 🔍 Search Terms

moduleResolution bundler esm imports

### ✅ 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

Add an option to enforce imports with file extension when the module is iESM (type: module) and moduleResolution is bundler.

### 📃 Motivating Example

For now in bundler moduleResolution, typescript is tolerent.
But when we develop a library, we have no idea of the strictness of the bundler (webpack is strict for example).
We need a way to enforce the imports with file extension in case the module is ESM

A dedicated option in the tsconfig can resolve it that we will enable or not

### 💻 Use Cases

1. What do you want to use this for?
2. What shortcomings exist with current approaches?
3. What workarounds are you using in the meantime?

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  2. 在 Issue 下留言说明你要接手 —— 这能避免两个人做同样的事。
  3. Fork 仓库,在一个分支上完成修改。
  4. 提交 Pull Request,并在描述里引用这个 Issue 编号。

调研方向

首先审查编译器的 moduleResolution bundler 行为及其对 ESM (type: module) 导入的处理。定义提议的 tsconfig 选项应如何在不改变现有行为的情况下强制要求文件扩展名,然后为 strict 和 non-strict 配置添加覆盖测试。完成标准是:启用该选项时,bundler resolution 会报告不带扩展名的 ESM 导入。

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技术栈
typescript
领域
compilers
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功能
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