sindresorhus/type-fest

Remove redundant code for compatibility with older versions of typescript

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#1,142 创建于 2025年5月16日

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 (7 评论) (0 反应) (0 负责人)TypeScript (12,328 star) (471 fork)batch import
enhancementgood first issue

描述

In some previously supported but now unsupported versions of typescript, there would be some incorrect circular check, and in order to bypass the circular check, we have to add some non-essential code, for example:

type A<T> = 
 SomeToolType<T> extends infer B 
  ? B
  : never // Never happen

The above code can be simplified now:

type A<T> = SomeToolType<T>

贡献者指南

技术栈
typescript
领域
toolingdeveloper experience
议题类型
refactor
难度面向新贡献者的预计实现难度，1 表示很小改动，5 表示专家级工作。
2
预计时间有经验贡献者完成调查、实现、测试并准备 pull request 的粗略时间范围。
under 1 hour
活动状态议题当前的可参与程度：新鲜、活跃、陈旧、阻塞或等待维护者输入。
fresh
清晰度议题是否清楚说明期望改动、验收标准和下一步。
clear
前置要求
familiarity with TypeScript genericsunderstanding of type fest patterns
新手友好度1-100 的估计分数，表示该议题对首次贡献者的友好程度。
85
研究方向
Search the codebase for patterns like `SomeToolType<T> extends infer B ? B : never` where the conditional type is unnecessary due to removed support for older TypeScript versions. Look in source type definitions for such redundant patterns and simplify them to directly use `SomeToolType<T>`. The issue provides an example; apply similar logic to other occurrences. Check the repository's CONTRIBUTING.md for contribution guidelines.
Remove redundant code for compatibility with older versions of typescript · sindresorhus/type-fest#1142 | Good First Issue