[RUBY] Addicted to the webpacker that comes standard with Rails 6


"Hmm? Shall we see it here?"

So, I was embarrassed to get hooked without noticing it, so I made a memorandum.

There is a lot of information on stories such as npm and yarn, so go there.

Target of build with webpacker of target system


<%= stylesheet_pack_tag 'application' %>
<%= javascript_pack_tag 'application', 'data-turbolinks-track': 'reload' %>

Since it is, both js and css are build targets.

File structure (only necessary parts)

└ javascript/
  └ packs/
  | └ application.js
  └ stylesheets/
    └ application.css
    └ custom.min.css


import "../stylesheets/application";


@import "~bootstrap/scss/bootstrap";
@import "./custom.min";


$ bin/webpack
ERROR in ./app/javascript/stylesheets/application.css
Module build failed (from ./node_modules/mini-css-extract-plugin/dist/loader.js):
ModuleBuildError: Module build failed (from ./node_modules/postcss-loader/src/index.js):
Error: Failed to find '~bootstrap/scss/bootstrap'

I checked the file structure including this area, but there was no problem.

I checked the error again. .. ..

ERROR in ./app/javascript/stylesheets/application.css


$ mv app/javascript/stylesheets/application.css app/javascript/stylesheets/application.scss

$ bin/webpack

Successful build. Tohoho. ..


Be careful with the extension.

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