Yarn 2 和 dart sass 与 create react app

Question

我一直在尝试更新 Create React App 以使用 yarn 2 和即插即用 (PNP)。当我在 .yarnrc.yml 中使用 nodeLinker: node-modules 时，我可以成功启动开发服务器。没有它，我最终得到

./src/App.scss (./.yarn/$$virtual/css-loader-virtual-fe3fa7be11/0/cache/css-loader-npm-3.4.2-300ee159b3-2.zip/node_modules/css-loader/dist/cjs.js??ref--6-oneOf-5-1!./.yarn/cache/postcss-loader-npm-3.0.0-f4ab99b685-2.zip/node_modules/postcss-loader/src??postcss!./.yarn/cache/resolve-url-loader-npm-3.1.1-cf1a268137-2.zip/node_modules/resolve-url-loader??ref--6-oneOf-5-3!./.yarn/unplugged/sass-loader-virtual-14ae4e1150/node_modules/sass-loader/dist/cjs.js??ref--6-oneOf-5-4!./src/App.scss)
Error: A package is trying to access a peer dependency that should be provided by its direct ancestor but isn't

Required package: node-sass (via "node-sass")
Required by: sass-loader@virtual:74ba539c0b6c6c8346ea151c91664bff0bef13782983a6f90ddf1a26160140360771dcf40d0863b46ff7add674bc2c42a37daea25f24f4ea96f7843786460ecd#npm:8.0.2 (via /Users/me/color-contrast-matrix/.yarn/unplugged/sass-loader-virtual-14ae4e1150/node_modules/sass-loader/dist/)

Answer 1

看起来 yarn 2 提供了一种覆盖包依赖项的方法。您必须提供缺少的依赖项，至少在这种情况下。

来自文档 current link:

Some packages may have been specified incorrectly with regard to their dependencies - for example with one dependency being missing, causing Yarn to refuse it the access. The packageExtensions fields offer a way to extend the existing package definitions with additional information. If you use it, consider sending a PR upstream and contributing your extension to the plugin-compat database.

安装node-sass并添加此配置后，编译成功

# .yarnrc.yml
packageExtensions:
  'sass-loader@*':
    optionalDependencies:
      node-sass: '*'

Answer 2

基于 wegry 的回答，更好的方法是修复 react-scripts，因为那是缺少对等依赖的地方。

#.yarnrc.yml

packageExtensions:
  'react-scripts@*':
    peerDependencies:
      node-sass: ^4.0.0 || ^5.0.0'    # Or sass: ^1.3.0'

我使用的版本与 sass-loader 当前依赖于 react-scripts 的版本的 peerDependency 相匹配。（我希望在 react-scripts 的下一个版本发布时，他们会修复这个错误。）

这是在告诉 Yarn react-scripts 确实应该对等依赖 sass（以及 node-sass），因此 sass-loader 可以使用它们。

sass-loader 本身已正确定义其依赖项。

Yarn 2 和 dart sass 与 create react app

Yarn 2 and dart sass with create react app

yarnpkg

sass-loader