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Clarify performance impact of project references on ts-server, and recommended usage of 'disableSourceOfProjectReferenceRedirect' or alternatives

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4/5
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3-5 天
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35/100
Issue 类型
文档
描述清晰度
基本清楚
活跃度
停滞
技术栈
typescript
领域
documentation

调研方向

先查看链接的 disableSourceOfProjectReferenceRedirect tsconfig 参考文档和 project references handbook 页面,然后检查 issue 42607 及链接的 Stack Overflow 问题。明确在 source redirects 保持启用时使用 project references 对 tsserver 性能的影响,并记录无需手动重新生成声明文件时针对 monorepo 的任何推荐设置或限制。

由索引模型根据 Issue 内容生成。

描述

From the docs (https://www.typescriptlang.org/tsconfig/#disableSourceOfProjectReferenceRedirect, https://www.typescriptlang.org/docs/handbook/project-references.html), it's clear that:

  • project references enable tsc -b for improved type-checking performance
  • they can also improve tsserver (and therefore IDE) performance if declaration files are 'pre-emitted' and you enable disableSourceOfProjectReferenceRedirect

In a monorepo, where most change units touch multiple projects, you want the behaviour of disableSourceOfProjectReferenceRedirect: false, ie you don't want to have to manually re-generate declaration files if you're changing a leaf project. Here's what's unclear: how is tsserver (and therefore IDE) performance affected by project references in this case? The docs should clarify:

  • whether tsserver performance is expected to improve with project references and disableSourceOfProjectReferenceRedirect: false, compared to without project references?
  • if not, whether there is a recommended setup to let tsserver benefit from project references without having to manually regenerate declaration files?

See also https://stackoverflow.com/questions/67093879/are-typescript-project-references-helpful-with-noemit (no real answer) and https://github.com/microsoft/TypeScript/issues/42607 (where according to the last benchmark by the submitter, project references actually slightly worsen performance, even after the patch).

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从这里开始

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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。

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