Investigate implicit excludes

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功能
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基本清楚
活跃度
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技术栈
typescript
领域
compilers

调研方向

首先复现 issue 中描述的 .js monorepo 布局,比较有无 jsconfig.json 以及使用显式 exclude 时的行为。调查当前隐式 exclude 行为如何处理 node_modules 的不同位置以及点文件。完成的标准是确定一种经过共识认可的方式,用于强制执行或禁用所提议的模式。

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描述

Domain: Performance

Today, TypeScript will implicitly set exclude to ./node_modules and something like .*/**/* to avoid dot files.

Unfortunately, there are two problems I believe I've found from chatting with users.

First, users often end up setting exclude which overrides the defaults. This often means that users accidentally over-include files, and that can cause performance issues.

Next, these defaults don't work out well enough, and end up going a bit off the rails in certain scenarios. For example, consider the following .js monorepo.

packages
+- package-aaa
|  +- node_modules    <- the cute tiny 10MB node_modules
|
+- jsconfig.json
+- node_modules        <- the slightly bigger 10GB node_modules
                         shared by each package

Notice that jsconfig.json or not, one of these node_modules is going to be crawled through unless exclude is set appropriately. And regardless of whether exclude is implicitly or explicitly on, it's usually wrong. In this case, it should (probably) be **/node_modules/**/*. For example, check out https://github.com/IBM/report-toolkit/pull/44/files

What I'm suggesting is to harden exclude to always contain the following paths regardless of whether exclude is set.

  • **/node_modules/**/*
  • .*/**

To disable this, users will have to turn off a setting like enableImplicitExcludePatterns.

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