在 Windows 10 中安装 expo-cli 最终会出现错误

Question

我在 windows 10 上安装了 nodejs v12.16.2 来配合 react-native 学习东西，所以不需要安装 android studio 或 xocde。正如我在 react-native 的文档中阅读的那样，最简单的方法是使用 expo-cli，我使用以下命令将其安装在我的机器上，但它不起作用：

$ npm install -g expo-cli

$ npm install expo-cli --global

$ yarn add global expo-cli

所有这些命令最终都会出错，我错过了什么，以及如何解决这个问题。 这是问题的详细信息：

npm install expo-cli --global                                                                        npm WARN deprecated joi@14.0.4: This version has been deprecated in accordance with the hapi support policy (hapi.im/support). Please upgrade to the latest version to get the best features, bug fixes, and security patches. If you are unable to upgrade at this time, paid support is available for older versions (hapi.im/commercial).
npm WARN deprecated request@2.88.2: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/traveling-fastlane-darwin@1.13.1 (node_modules\expo-cli\node_modules\@expo\traveling-fastlane-darwin):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/traveling-fastlane-darwin@1.13.1: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-freebsd-x64@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-freebsd-x64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-freebsd-x64@2.2.8: wanted {"os":"freebsd","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-darwin-ia32@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-darwin-ia32):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-darwin-ia32@2.2.8: wanted {"os":"darwin","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-darwin-x64@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-darwin-x64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-darwin-x64@2.2.8: wanted {"os":"darwin","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-freebsd-ia32@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-freebsd-ia32):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-freebsd-ia32@2.2.8: wanted {"os":"freebsd","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-linux-arm64@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-linux-arm64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-linux-arm64@2.2.8: wanted {"os":"linux","arch":"arm64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-linux-ia32@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-linux-ia32):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-linux-ia32@2.2.8: wanted {"os":"linux","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-linux-arm@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-linux-arm):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-linux-arm@2.2.8: wanted {"os":"linux","arch":"arm"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-sunos-x64@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-sunos-x64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-sunos-x64@2.2.8: wanted {"os":"sunos","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-linux-x64@2.2.8 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-linux-x64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-linux-x64@2.2.8: wanted {"os":"linux","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/ngrok-bin-win32-x64@2.2.8-beta.1 (node_modules\expo-cli\node_modules\@expo\ngrok-bin\node_modules\@expo\ngrok-bin-win32-x64):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/ngrok-bin-win32-x64@2.2.8-beta.1: wanted {"os":"win32","arch":"x64"} (current: {"os":"win32","arch":"ia32"})

npm ERR! Unexpected end of JSON input while parsing near '...in-proposal-unicode-p'

Answer 1

由于使用 npm 中的 optionalDependencies 安装适用于您的平台的 ngrok 包，您看到的警告是不可避免的，所以不要担心。与您相关的错误是“npm ERR！在解析附近时 JSON 输入意外结束...” - 有很多关于此主题的相关帖子，他们通常建议您执行以下操作：

1. 清除npm缓存npm cache clean --force
2. 再次运行安装npm i -g expo-cli

请参阅https://stackoverflow.com/a/47896884/659988，了解使用不同包的类似问题的示例。