Error message

Running command - failed![ERROR] An error occurred while running npm install (exit code 1):

    module.js:471
        throw err;
        ^

    Error: Cannot find module '../lib/utils/unsupported.js'
        at Function.Module._resolveFilename (module.js:469:15)
        at Function.Module._load (module.js:417:25)
        at Module.require (module.js:497:17)
        at require (internal/module.js:20:19)
        at /usr/local/lib/node_modules/npm/bin/npm-cli.js:19:21
        at Object.<anonymous> (/usr/local/lib/node_modules/npm/bin/npm-cli.js:79:3)
        at Module._compile (module.js:570:32)
        at Object.Module._extensions..js (module.js:579:10)
        at Module.load (module.js:487:32)
        at tryModuleLoad (module.js:446:12)

Try to remove /usr/local/lib/node_modules/npm and reinstall node again. This should work.

On MacOS with Homebrew:

sudo rm -rf /usr/local/lib/node_modules/npm
brew reinstall node

Other Solution –

1) Run following commands:

sudo rm -rf /usr/local/lib/node_modules/npm
brew uninstall --force node      

2) Then, proceed to Node.js Official Website https://nodejs.org/en/download/current/ to download latest package for new installation.

3) Run your npm command again, which should longer have any errors.

This method is working on macOS Mojave Version 10.14.4