Yarn1.6.0（Node.js10）一部のパッケージをインストールしようとした際に下記のようなエラーが出ました。

環境

• Mac OSX 10.13.4
• Yarn 1.6.0
• Node.js 10.0.0

発生したエラー

terminalCopy code$ yarn
yarn install v1.6.0
(node:842) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
warning ../package.json: No license field
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
error upath@1.0.4: The engine "node" is incompatible with this module. Expected version ">=4 <=9".
error Found incompatible module


info Visit https://yarnpkg.com/en/docs/cli/install for documentation about this command.

こちらの記事を参考に解決できたのでメモします。

参考 Qiita
https://qiita.com/DQNEO/items/372f20b17af8af8c4d11

原因

原因としてはupathというライブラリにenginesが指定がされているためです。

jsonCopy code"engines": {
  "node": ">=4 <=9"
},

参考 Github
https://github.com/anodynos/upath/blob/3bdcd474017e7635ecbc7509ea03c6b036df3b8d/package.json#L43

解決方法

インストール時に--ignore-enginesのオプションを付与してあげます。

terminalCopy code$ yarn install --ignore-engines
yarn install v1.6.0
(node:847) [DEP0005] DeprecationWarning: Buffer() is deprecated due to security and usability issues. Please use the Buffer.alloc(), Buffer.allocUnsafe(), or Buffer.from() methods instead.
warning ../package.json: No license field
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
[3/4] 🔗  Linking dependencies...
warning "react-icons > react-icon-base@2.1.0" has unmet peer dependency "prop-types@*".
warning " > redux-devtools-extension@2.13.2" has incorrect peer dependency "redux@^3.1.0".
warning "@zeit/next-css > extract-text-webpack-plugin@3.0.2" has unmet peer dependency "webpack@^3.1.0".
warning " > react-addons-test-utils@15.6.2" has incorrect peer dependency "react-dom@^15.4.2".
[4/4] 📃  Building fresh packages...
✨  Done in 18.81s.