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I installed nodejs v12.16.2 on windows 10 to work with react-native for learning stuff, so there is no need to install android studio or xocde. The simplest way for doing that as i read in the documentation of react-native is by using expo-cli, i used the following commands to install it on my machine but it doesn't work:

$ npm install -g expo-cli

$ npm install expo-cli --global

$ yarn add global expo-cli

all these commands ends up with errors, what do i missed, and how to fix this problem. here is the details of the problem:

npm install expo-cli --global                                                                        npm WARN deprecated [email protected]: 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 [email protected]: request has been deprecated, see https://github.com/request/request/issues/3142
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (node_modules\expo-cli\node_modules\@expo\traveling-fastlane-darwin):
npm WARN notsup SKIPPING OPTIONAL DEPENDENCY: Unsupported platform for @expo/[email protected]: wanted {"os":"darwin","arch":"any"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"freebsd","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"darwin","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"darwin","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"freebsd","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"linux","arch":"arm64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"linux","arch":"ia32"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"linux","arch":"arm"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"sunos","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"linux","arch":"x64"} (current: {"os":"win32","arch":"ia32"})
npm WARN optional SKIPPING OPTIONAL DEPENDENCY: @expo/[email protected] (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/[email protected]: wanted {"os":"win32","arch":"x64"} (current: {"os":"win32","arch":"ia32"})

npm ERR! Unexpected end of JSON input while parsing near '...in-proposal-unicode-p'
brentvatne
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Hardood
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1 Answers1

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The warnings you see are unavoidable as a result of using optionalDependencies from npm to install the ngrok package that works for your platform, so do not worry about that. The error that is relevant to you is "npm ERR! Unexpected end of JSON input while parsing near ..." - there are a lot of related posts on this topic and they usually recommend that you do the following:

  1. Clear the npm cache npm cache clean --force
  2. Run the install again npm i -g expo-cli

See https://stackoverflow.com/a/47896884/659988 for an example of a similar problem with a different package.

brentvatne
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