Initial implementation

ursm · claude · ursm · commit f74a212a86b1 · 2026-04-03T20:49:39.000+09:00
Automatically vendor CSS files when pinning packages with importmap-rails.
If a pinned package declares a style field in its package.json, the
corresponding CSS file is downloaded to vendor/stylesheets/.

Co-Authored-By: Claude Opus 4.6 (1M context) &lt;noreply@anthropic.com&gt;
diff --git a/.github/workflows/test.yml b/.github/workflows/test.yml
@@ -0,0 +1,29 @@
+name: Test
+
+on:
+  push:
+    branches: [main]
+  pull_request:
+
+jobs:
+  test:
+    runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby: ['3.3', '3.4', '4.0']
+        rails: ['7.2', '8.0', '8.1']
+        exclude:
+          - ruby: '4.0'
+            rails: '7.2'
+          - ruby: '4.0'
+            rails: '8.0'
+    env:
+      RAILS_VERSION: ${{ matrix.rails }}
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ruby/setup-ruby@v1
+        with:
+          ruby-version: ${{ matrix.ruby }}
+          bundler-cache: true
+      - run: bundle exec rake test
diff --git a/Gemfile b/Gemfile
@@ -0,0 +1,9 @@
+source 'https://rubygems.org'
+
+gemspec
+
+if (rails_version = ENV['RAILS_VERSION'])
+  gem 'railties', "~> #{rails_version}.0"
+end
+
+gem 'webmock'
diff --git a/Gemfile.lock b/Gemfile.lock
@@ -0,0 +1,223 @@
+PATH
+  remote: .
+  specs:
+    importmap-rails-css (0.1.0)
+      importmap-rails (>= 2.0)
+      railties (>= 7.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    actionpack (8.1.3)
+      actionview (= 8.1.3)
+      activesupport (= 8.1.3)
+      nokogiri (>= 1.8.5)
+      rack (>= 2.2.4)
+      rack-session (>= 1.0.1)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+      useragent (~> 0.16)
+    actionview (8.1.3)
+      activesupport (= 8.1.3)
+      builder (~> 3.1)
+      erubi (~> 1.11)
+      rails-dom-testing (~> 2.2)
+      rails-html-sanitizer (~> 1.6)
+    activesupport (8.1.3)
+      base64
+      bigdecimal
+      concurrent-ruby (~> 1.0, >= 1.3.1)
+      connection_pool (>= 2.2.5)
+      drb
+      i18n (>= 1.6, < 2)
+      json
+      logger (>= 1.4.2)
+      minitest (>= 5.1)
+      securerandom (>= 0.3)
+      tzinfo (~> 2.0, >= 2.0.5)
+      uri (>= 0.13.1)
+    addressable (2.8.9)
+      public_suffix (>= 2.0.2, < 8.0)
+    base64 (0.3.0)
+    bigdecimal (4.1.0)
+    builder (3.3.0)
+    concurrent-ruby (1.3.6)
+    connection_pool (3.0.2)
+    crack (1.0.1)
+      bigdecimal
+      rexml
+    crass (1.0.6)
+    date (3.5.1)
+    drb (2.2.3)
+    erb (6.0.2)
+    erubi (1.13.1)
+    hashdiff (1.2.1)
+    i18n (1.14.8)
+      concurrent-ruby (~> 1.0)
+    importmap-rails (2.2.3)
+      actionpack (>= 6.0.0)
+      activesupport (>= 6.0.0)
+      railties (>= 6.0.0)
+    io-console (0.8.2)
+    irb (1.17.0)
+      pp (>= 0.6.0)
+      prism (>= 1.3.0)
+      rdoc (>= 4.0.0)
+      reline (>= 0.4.2)
+    json (2.19.3)
+    logger (1.7.0)
+    loofah (2.25.1)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.12.0)
+    minitest (6.0.3)
+      drb (~> 2.0)
+      prism (~> 1.5)
+    nokogiri (1.19.2-aarch64-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-aarch64-linux-musl)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm-linux-musl)
+      racc (~> 1.4)
+    nokogiri (1.19.2-arm64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-linux-gnu)
+      racc (~> 1.4)
+    nokogiri (1.19.2-x86_64-linux-musl)
+      racc (~> 1.4)
+    pp (0.6.3)
+      prettyprint
+    prettyprint (0.2.0)
+    prism (1.9.0)
+    psych (5.3.1)
+      date
+      stringio
+    public_suffix (7.0.5)
+    racc (1.8.1)
+    rack (3.2.6)
+    rack-session (2.1.1)
+      base64 (>= 0.1.0)
+      rack (>= 3.0.0)
+    rack-test (2.2.0)
+      rack (>= 1.3)
+    rackup (2.3.1)
+      rack (>= 3)
+    rails-dom-testing (2.3.0)
+      activesupport (>= 5.0.0)
+      minitest
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.7.0)
+      loofah (~> 2.25)
+      nokogiri (>= 1.15.7, != 1.16.7, != 1.16.6, != 1.16.5, != 1.16.4, != 1.16.3, != 1.16.2, != 1.16.1, != 1.16.0.rc1, != 1.16.0)
+    railties (8.1.3)
+      actionpack (= 8.1.3)
+      activesupport (= 8.1.3)
+      irb (~> 1.13)
+      rackup (>= 1.0.0)
+      rake (>= 12.2)
+      thor (~> 1.0, >= 1.2.2)
+      tsort (>= 0.2)
+      zeitwerk (~> 2.6)
+    rake (13.3.1)
+    rdoc (7.2.0)
+      erb
+      psych (>= 4.0.0)
+      tsort
+    reline (0.6.3)
+      io-console (~> 0.5)
+    rexml (3.4.4)
+    securerandom (0.4.1)
+    stringio (3.2.0)
+    thor (1.5.0)
+    tsort (0.2.0)
+    tzinfo (2.0.6)
+      concurrent-ruby (~> 1.0)
+    uri (1.1.1)
+    useragent (0.16.11)
+    webmock (3.26.2)
+      addressable (>= 2.8.0)
+      crack (>= 0.3.2)
+      hashdiff (>= 0.4.0, < 2.0.0)
+    zeitwerk (2.7.5)
+
+PLATFORMS
+  aarch64-linux-gnu
+  aarch64-linux-musl
+  arm-linux-gnu
+  arm-linux-musl
+  arm64-darwin
+  x86_64-darwin
+  x86_64-linux-gnu
+  x86_64-linux-musl
+
+DEPENDENCIES
+  importmap-rails-css!
+  webmock
+
+CHECKSUMS
+  actionpack (8.1.3) sha256=af998cae4d47c5d581a2cc363b5c77eb718b7c4b45748d81b1887b25621c29a3
+  actionview (8.1.3) sha256=1347c88c7f3edb38100c5ce0e9fb5e62d7755f3edc1b61cce2eb0b2c6ea2fd5d
+  activesupport (8.1.3) sha256=21a5e0dfbd4c3ddd9e1317ec6a4d782fa226e7867dc70b0743acda81a1dca20e
+  addressable (2.8.9) sha256=cc154fcbe689711808a43601dee7b980238ce54368d23e127421753e46895485
+  base64 (0.3.0) sha256=27337aeabad6ffae05c265c450490628ef3ebd4b67be58257393227588f5a97b
+  bigdecimal (4.1.0) sha256=6dc07767aa3dc456ccd48e7ae70a07b474e9afd7c5bc576f80bd6da5c8dd6cae
+  builder (3.3.0) sha256=497918d2f9dca528fdca4b88d84e4ef4387256d984b8154e9d5d3fe5a9c8835f
+  concurrent-ruby (1.3.6) sha256=6b56837e1e7e5292f9864f34b69c5a2cbc75c0cf5338f1ce9903d10fa762d5ab
+  connection_pool (3.0.2) sha256=33fff5ba71a12d2aa26cb72b1db8bba2a1a01823559fb01d29eb74c286e62e0a
+  crack (1.0.1) sha256=ff4a10390cd31d66440b7524eb1841874db86201d5b70032028553130b6d4c7e
+  crass (1.0.6) sha256=dc516022a56e7b3b156099abc81b6d2b08ea1ed12676ac7a5657617f012bd45d
+  date (3.5.1) sha256=750d06384d7b9c15d562c76291407d89e368dda4d4fff957eb94962d325a0dc0
+  drb (2.2.3) sha256=0b00d6fdb50995fe4a45dea13663493c841112e4068656854646f418fda13373
+  erb (6.0.2) sha256=9fe6264d44f79422c87490a1558479bd0e7dad4dd0e317656e67ea3077b5242b
+  erubi (1.13.1) sha256=a082103b0885dbc5ecf1172fede897f9ebdb745a4b97a5e8dc63953db1ee4ad9
+  hashdiff (1.2.1) sha256=9c079dbc513dfc8833ab59c0c2d8f230fa28499cc5efb4b8dd276cf931457cd1
+  i18n (1.14.8) sha256=285778639134865c5e0f6269e0b818256017e8cde89993fdfcbfb64d088824a5
+  importmap-rails (2.2.3) sha256=7101be2a4dc97cf1558fb8f573a718404c5f6bcfe94f304bf1f39e444feeb16a
+  importmap-rails-css (0.1.0)
+  io-console (0.8.2) sha256=d6e3ae7a7cc7574f4b8893b4fca2162e57a825b223a177b7afa236c5ef9814cc
+  irb (1.17.0) sha256=168c4ddb93d8a361a045c41d92b2952c7a118fa73f23fe14e55609eb7a863aae
+  json (2.19.3) sha256=289b0bb53052a1fa8c34ab33cc750b659ba14a5c45f3fcf4b18762dc67c78646
+  logger (1.7.0) sha256=196edec7cc44b66cfb40f9755ce11b392f21f7967696af15d274dde7edff0203
+  loofah (2.25.1) sha256=d436c73dbd0c1147b16c4a41db097942d217303e1f7728704b37e4df9f6d2e04
+  minitest (6.0.3) sha256=88ac8a1de36c00692420e7cb3cc11a0773bbcb126aee1c249f320160a7d11411
+  nokogiri (1.19.2-aarch64-linux-gnu) sha256=c34d5c8208025587554608e98fd88ab125b29c80f9352b821964e9a5d5cfbd19
+  nokogiri (1.19.2-aarch64-linux-musl) sha256=7f6b4b0202d507326841a4f790294bf75098aef50c7173443812e3ac5cb06515
+  nokogiri (1.19.2-arm-linux-gnu) sha256=b7fa1139016f3dc850bda1260988f0d749934a939d04ef2da13bec060d7d5081
+  nokogiri (1.19.2-arm-linux-musl) sha256=61114d44f6742ff72194a1b3020967201e2eb982814778d130f6471c11f9828c
+  nokogiri (1.19.2-arm64-darwin) sha256=58d8ea2e31a967b843b70487a44c14c8ba1866daa1b9da9be9dbdf1b43dee205
+  nokogiri (1.19.2-x86_64-darwin) sha256=7d9af11fda72dfaa2961d8c4d5380ca0b51bc389dc5f8d4b859b9644f195e7a4
+  nokogiri (1.19.2-x86_64-linux-gnu) sha256=fa8feca882b73e871a9845f3817a72e9734c8e974bdc4fbad6e4bc6e8076b94f
+  nokogiri (1.19.2-x86_64-linux-musl) sha256=93128448e61a9383a30baef041bf1f5817e22f297a1d400521e90294445069a8
+  pp (0.6.3) sha256=2951d514450b93ccfeb1df7d021cae0da16e0a7f95ee1e2273719669d0ab9df6
+  prettyprint (0.2.0) sha256=2bc9e15581a94742064a3cc8b0fb9d45aae3d03a1baa6ef80922627a0766f193
+  prism (1.9.0) sha256=7b530c6a9f92c24300014919c9dcbc055bf4cdf51ec30aed099b06cd6674ef85
+  psych (5.3.1) sha256=eb7a57cef10c9d70173ff74e739d843ac3b2c019a003de48447b2963d81b1974
+  public_suffix (7.0.5) sha256=1a8bb08f1bbea19228d3bed6e5ed908d1cb4f7c2726d18bd9cadf60bc676f623
+  racc (1.8.1) sha256=4a7f6929691dbec8b5209a0b373bc2614882b55fc5d2e447a21aaa691303d62f
+  rack (3.2.6) sha256=5ed78e1f73b2e25679bec7d45ee2d4483cc4146eb1be0264fc4d94cb5ef212c2
+  rack-session (2.1.1) sha256=0b6dc07dea7e4b583f58a48e8b806d4c9f1c6c9214ebc202ec94562cbea2e4e9
+  rack-test (2.2.0) sha256=005a36692c306ac0b4a9350355ee080fd09ddef1148a5f8b2ac636c720f5c463
+  rackup (2.3.1) sha256=6c79c26753778e90983761d677a48937ee3192b3ffef6bc963c0950f94688868
+  rails-dom-testing (2.3.0) sha256=8acc7953a7b911ca44588bf08737bc16719f431a1cc3091a292bca7317925c1d
+  rails-html-sanitizer (1.7.0) sha256=28b145cceaf9cc214a9874feaa183c3acba036c9592b19886e0e45efc62b1e89
+  railties (8.1.3) sha256=913eb0e0cb520aac687ffd74916bd726d48fa21f47833c6292576ef6a286de22
+  rake (13.3.1) sha256=8c9e89d09f66a26a01264e7e3480ec0607f0c497a861ef16063604b1b08eb19c
+  rdoc (7.2.0) sha256=8650f76cd4009c3b54955eb5d7e3a075c60a57276766ebf36f9085e8c9f23192
+  reline (0.6.3) sha256=1198b04973565b36ec0f11542ab3f5cfeeec34823f4e54cebde90968092b1835
+  rexml (3.4.4) sha256=19e0a2c3425dfbf2d4fc1189747bdb2f849b6c5e74180401b15734bc97b5d142
+  securerandom (0.4.1) sha256=cc5193d414a4341b6e225f0cb4446aceca8e50d5e1888743fac16987638ea0b1
+  stringio (3.2.0) sha256=c37cb2e58b4ffbd33fe5cd948c05934af997b36e0b6ca6fdf43afa234cf222e1
+  thor (1.5.0) sha256=e3a9e55fe857e44859ce104a84675ab6e8cd59c650a49106a05f55f136425e73
+  tsort (0.2.0) sha256=9650a793f6859a43b6641671278f79cfead60ac714148aabe4e3f0060480089f
+  tzinfo (2.0.6) sha256=8daf828cc77bcf7d63b0e3bdb6caa47e2272dcfaf4fbfe46f8c3a9df087a829b
+  uri (1.1.1) sha256=379fa58d27ffb1387eaada68c749d1426738bd0f654d812fcc07e7568f5c57c6
+  useragent (0.16.11) sha256=700e6413ad4bb954bb63547fa098dddf7b0ebe75b40cc6f93b8d54255b173844
+  webmock (3.26.2) sha256=774556f2ea6371846cca68c01769b2eac0d134492d21f6d0ab5dd643965a4c90
+  zeitwerk (2.7.5) sha256=d8da92128c09ea6ec62c949011b00ed4a20242b255293dd66bf41545398f73dd
+
+BUNDLED WITH
+  4.0.9
diff --git a/README.md b/README.md
@@ -0,0 +1,39 @@
+# importmap-rails-css
+
+Automatically vendors CSS files when pinning packages with [importmap-rails](https://github.com/rails/importmap-rails). If a pinned package declares a `style` field in its `package.json`, the corresponding CSS file is downloaded to `vendor/stylesheets/`.
+
+## Installation
+
+Add to your Gemfile:
+
+```ruby
+gem 'importmap-rails-css'
+```
+
+## Usage
+
+Just run `bin/importmap pin` as usual:
+
+```
+$ bin/importmap pin flatpickr
+Pinning "flatpickr" to vendor/javascript/flatpickr.js via download from https://ga.jspm.io/npm:flatpickr@4.6.13/dist/flatpickr.js
+Pinning CSS "flatpickr" to vendor/stylesheets/flatpickr.css via download from https://cdn.jsdelivr.net/npm/flatpickr@4.6.13/dist/flatpickr.css
+```
+
+`bin/importmap update` and `bin/importmap pristine` also download CSS in the same way.
+
+`bin/importmap unpin` removes the corresponding CSS file as well.
+
+Packages without a `style` field in their `package.json` are silently skipped.
+
+## Where CSS files are placed
+
+Downloaded CSS files go into `vendor/stylesheets/`. This directory is automatically added to the asset path by the gem's Engine, so you can link them with `stylesheet_link_tag`:
+
+```erb
+<%= stylesheet_link_tag 'flatpickr' %>
+```
+
+## License
+
+MIT
diff --git a/Rakefile b/Rakefile
@@ -0,0 +1,8 @@
+require 'rake/testtask'
+
+Rake::TestTask.new(:test) do |t|
+  t.libs << 'test'
+  t.pattern = 'test/**/*_test.rb'
+end
+
+task default: :test
diff --git a/importmap-rails-css.gemspec b/importmap-rails-css.gemspec
@@ -0,0 +1,19 @@
+require_relative 'lib/importmap_rails_css/version'
+
+Gem::Specification.new do |spec|
+  spec.name    = 'importmap-rails-css'
+  spec.version = ImportmapRailsCss::VERSION
+  spec.authors = ['ursm']
+
+  spec.summary  = 'Automatically vendor CSS from pinned importmap packages'
+  spec.homepage = 'https://github.com/ursm/importmap-rails-css'
+  spec.license  = 'MIT'
+
+  spec.required_ruby_version = '>= 3.3'
+
+  spec.files = Dir['lib/**/*', 'LICENSE', 'README.md']
+
+  spec.add_dependency 'importmap-rails', '>= 2.0'
+  spec.add_dependency 'railties',        '>= 7.0'
+
+end
diff --git a/lib/importmap-rails-css.rb b/lib/importmap-rails-css.rb
@@ -0,0 +1,8 @@
+require 'importmap-rails'
+require 'importmap/packager'
+
+require_relative 'importmap_rails_css/version'
+require_relative 'importmap_rails_css/packager_extension'
+require_relative 'importmap_rails_css/engine'
+
+Importmap::Packager.prepend ImportmapRailsCss::PackagerExtension
diff --git a/lib/importmap_rails_css/engine.rb b/lib/importmap_rails_css/engine.rb
@@ -0,0 +1,9 @@
+module ImportmapRailsCss
+  class Engine < ::Rails::Engine
+    initializer 'importmap_rails_css.assets' do |app|
+      if app.config.respond_to?(:assets)
+        app.config.assets.paths << Rails.root.join('vendor/stylesheets')
+      end
+    end
+  end
+end
diff --git a/lib/importmap_rails_css/packager_extension.rb b/lib/importmap_rails_css/packager_extension.rb
diff --git a/lib/importmap_rails_css/version.rb b/lib/importmap_rails_css/version.rb
diff --git a/test/packager_extension_test.rb b/test/packager_extension_test.rb
diff --git a/test/test_helper.rb b/test/test_helper.rb
