Why both `stylesheet_link_tag` and `stylesheet_pack_tag` are needed to install bootstrap?

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I have gone through this article to install bootstrap in ruby-on-rails app.

And I noticed that there are stylesheet_link_tag and stylesheet_pack_tag for css. I wonder why both is needed, isn't one is enough in app/views/layouts/application.html.erb?

<head>
  <title>BootstrapDemo</title>
  <%= csrf_meta_tags %>
  <%= csp_meta_tag %>
  <%= stylesheet_link_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
  <%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>
  <%= stylesheet_pack_tag 'application', media: 'all', 'data-turbolinks-track': 'reload' %>
</head>
bootstrap-5 ruby-on-rails
1 Answers

stylesheet_pack_tag 'application' is a webpacker helper method, it loads styles that are imported in app/javascript/packs/application.js. If you set up bootstrap in app/javascript/ then pack tags are required.

stylesheet_link_tag 'application' is a sprockets helper method, it loads styles from app/assets/stylsheets/application.css. If you don't use that file for anything then stylesheet_link_tag can be removed.

app/
  assets/                # used by sprockets aka rails asset pipeline
    stylesheets/
      application.css    # stylesheet_link_tag 'application'
    javascripts/
      application.js     # javascript_include_tag 'application'

  javascript/            # used by rails webpacker
    packs/
      application.js     # javascript_pack_tag 'application'
                         # stylesheet_pack_tag 'application' # => includes 'styles.css'
    stylesheets/
      styles.css         # must be imported in packs/application.js
user_2070900
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