npm cache clear --force
npm i -g laravel-mix@latest
npm i -g postcss@latest
npm install --save-dev file-loader url-loader
npm install resolve-url-loader sass sass-loader alpinejs --save-dev
npm i -g webpack webpack-cli webpack-dev-server 

curl -fsSL https://deb.nodesource.com/setup_16.x | sudo -E bash -






---------------
file: resources/js/app.js

import Alpine from 'alpinejs'

window.Alpine = Alpine
Alpine.start()

file: webpack.mix.js
const mix = require('laravel-mix');
const tailwindcss = require('tailwindcss');

mix.js('resources/js/app.js', 'public/js')
    .sass('resources/sass/app.scss', 'public/css')
    .options({
        postCss: [ tailwindcss('./tailwind.config.js') ],
    });

-------------------

sudo npm cache clean -f
sudo npm install -g n
sudo n stable
To upgrade to latest version (and not current stable) version, you can use

sudo n latest