Add Bootstrap to Rails 6

add_bootstrap_rails6.md

Add Bootstrap 4 to Rails 6

run in terminal (project dir):

yarn add [email protected] jquery popper.js

file: app/assets/stylesheets/application.css

rename to: .scss

insert: *= require bootstrap

in file: app/javascript/packs/application.js

insert: import "bootstrap"

in file: config/webpack/environment.js

insert:

const webpack = require("webpack")
environment.plugins.append("Provide", new webpack.ProvidePlugin({
         $: 'jquery',
         jQuery: 'jquery',
         Popper: ['popper.js', 'default']
}))