On Mac, Unable to install the oneSignal plugin on Ionic

I am working on an Ionic application which uses the oneSignal plugin. My project is developed under Windows and the plugin works very well. But when I recover my project on mac, the plugin refuses to install

  1. I get my project with the git commands

  2. I open the access rights to my project folder

  3. I added :

sudo npm i --unsafe-perm
sudo gem install cocoapods
pod setup
pod repo update
  1. finally when I add
sudo cordova platform add ios@latest

I get this warning :

"framework" tag with type "podspec" is deprecated and will be removed. Please use the "podspec" tag.

Failed to install 'onesignal-cordova-plugin': undefined

Failed to restore plugin "onesignal-cordova-plugin" from config.xml. You might need to try adding it again. 
Error: /Library/Ruby/Gems/2.3.0/gems/claide-1.0.3/lib/claide/command.rb:439:in `help!':
 [!] You cannot run CocoaPods as root. (CLAide::Help)

If I try to uninstall and install oneSignal again I get this alert :

"framework" tag with type "podspec" is deprecated and will be removed. Please use the "podspec" tag.
Failed to install 'onesignal-cordova-plugin': undefined

CordovaError: Promise rejected with non-error: '/Library/Ruby/Gems/2.3.0/gems/claide-1.0.3/lib/claide/command.rb:439:in `help!\': \u001b[31m[!] You cannot run CocoaPods as root.\u001b[39m (CLAide::Help)\n\n\u001b[4mUsage:\u001b[24m\n\n    $ \u001b[32mpod\u001b[39m \u001b[32mCOMMAND\u001b[39m\n\n      CocoaPods, the Cocoa library package manager.\n\n\u001b[4mCommands:\u001b[24m\n\n    \u001b[32m+ cache\u001b[39m      Manipulate the CocoaPods cache\n    \u001b[32m+ env\u001b[39m        Display pod environment\n    \u001b[32m+ init\u001b[39m       Generate a Podfile for the current directory\n    \u001b[32m+ install\u001b[39m    Install project dependencies according to versions from a\n                 Podfile.lock\n    \u001b[32m+ ipc\u001b[39m        Inter-process communication\n    \u001b[32m+ lib\u001b[39m        Develop pods\n    \u001b[32m+ list\u001b[39m       List pods\n    \u001b[32m+ outdated\u001b[39m   Show outdated project dependencies\n    \u001b[32m+ repo\u001b[39m       Manage spec-repositories\n    \u001b[32m+ setup\u001b[39m      Setup the CocoaPods environment\n    \u001b[32m+ spec\u001b[39m       Manage pod specs\n    \u001b[32m+ update\u001b[39m     Update outdated project dependencies and create new Podfile.lock\n\n\u001b[4mOptions:\u001b[24m\n\n    \u001b[34m--silent\u001b[39m     Show nothing\n    \u001b[34m--version\u001b[39m    Show the version of the tool\n    \u001b[34m--verbose\u001b[39m    Show more debugging information\n    \u001b[34m--no-ansi\u001b[39m    Show output without ANSI codes\n    \u001b[34m--help\u001b[39m       Show help banner of specified command\n\tfrom /Library/Ruby/Gems/2.3.0/gems/cocoapods-1.8.4/lib/cocoapods/command.rb:47:in `run\'\n\tfrom /Library/Ruby/Gems/2.3.0/gems/cocoapods-1.8.4/bin/pod:55:in `<top (required)>\'\n\tfrom /usr/local/bin/pod:22:in `load\'\n\tfrom /usr/local/bin/pod:22:in `<main>\'\n'

I saw that it was advisable to install the oneSignal plugin without sudo but when I do this I get this error message:

Error: EACCES: permission denied, open '/Users/macos/Library/Preferences/insight-nodejs/insight-cordova.json.1999532748'

Cordova -v : 9.0.0 (cordova-lib@9.0.1) - ionic -v : 5.2.3

Do you have any idea of the problem ?

Refer this link https://github.com/OneSignal/OneSignal-Cordova-SDK/issues/223

Never run anything involving Ionic development with elevated privileges. It’s a needless security risk, it makes your system impossible for others to replicate, so your bugs will remain mysterious to everybody without your specific computer, and as you’ve discovered, CocoaPods are trying to save you from yourself. Let nvm manage your node installation instead.

Thank you for your reply. Finally I uninstall everything to start again. It works but difficult to say what the problem was really …