Add default support for the Propshaft asset pipeline

.github/workflows/ci.yml

@@ -9,7 +9,8 @@ jobs:
           - "3.0"
         gemfile:
           - Gemfile
-          - gemfiles/rails_7.gemfile
+          - gemfiles/rails_7_propshaft.gemfile
+          - gemfiles/rails_7_sprockets.gemfile
         continue-on-error: [ false ]
 
     name: ${{ format('Tests (Ruby {0}, {1})', matrix.ruby-version, matrix.gemfile) }}

Appraisals

@@ -1,4 +1,9 @@
-appraise "rails_7" do
+appraise "rails_7_sprockets" do
   gem "rails", github: "rails/rails", ref: "main"
   gem "sprockets-rails"
 end
+
+appraise "rails_7_propshaft" do
+  gem "rails", github: "rails/rails", ref: "main"
+  gem "propshaft"
+end

gemfiles/rails_7_propshaft.gemfile

@@ -0,0 +1,23 @@
+# This file was generated by Appraisal
+
+source "https://rubygems.org"
+
+gem "rails", ref: "main", git: "https://github.com/rails/rails.git"
+gem "sqlite3"
+gem "propshaft"
+
+group :development do
+  gem "appraisal"
+end
+
+group :test do
+  gem "turbo-rails"
+  gem "stimulus-rails"
+  gem "byebug"
+  gem "rexml"
+  gem "capybara"
+  gem "selenium-webdriver"
+  gem "webdrivers"
+end
+
+gemspec path: "../"

gemfiles/rails_7_propshaft.gemfile.lock

@@ -0,0 +1,190 @@
+GIT
+  remote: https://github.com/rails/rails.git
+  revision: 6e1694275007b94b8112455ac53e8a345938376e
+  ref: main
+  specs:
+    actioncable (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      nio4r (~> 2.0)
+      websocket-driver (>= 0.6.1)
+    actionmailbox (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      activejob (= 7.0.0.alpha2)
+      activerecord (= 7.0.0.alpha2)
+      activestorage (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      mail (>= 2.7.1)
+    actionmailer (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      actionview (= 7.0.0.alpha2)
+      activejob (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      mail (~> 2.5, >= 2.5.4)
+      rails-dom-testing (~> 2.0)
+    actionpack (7.0.0.alpha2)
+      actionview (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      rack (~> 2.0, >= 2.2.0)
+      rack-test (>= 0.6.3)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.0, >= 1.2.0)
+    actiontext (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      activerecord (= 7.0.0.alpha2)
+      activestorage (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      nokogiri (>= 1.8.5)
+    actionview (7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      builder (~> 3.1)
+      erubi (~> 1.4)
+      rails-dom-testing (~> 2.0)
+      rails-html-sanitizer (~> 1.1, >= 1.2.0)
+    activejob (7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      globalid (>= 0.3.6)
+    activemodel (7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+    activerecord (7.0.0.alpha2)
+      activemodel (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+    activestorage (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      activejob (= 7.0.0.alpha2)
+      activerecord (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      marcel (~> 1.0)
+      mini_mime (>= 1.1.0)
+    activesupport (7.0.0.alpha2)
+      concurrent-ruby (~> 1.0, >= 1.0.2)
+      i18n (>= 1.6, < 2)
+      minitest (>= 5.1)
+      tzinfo (~> 2.0)
+    rails (7.0.0.alpha2)
+      actioncable (= 7.0.0.alpha2)
+      actionmailbox (= 7.0.0.alpha2)
+      actionmailer (= 7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      actiontext (= 7.0.0.alpha2)
+      actionview (= 7.0.0.alpha2)
+      activejob (= 7.0.0.alpha2)
+      activemodel (= 7.0.0.alpha2)
+      activerecord (= 7.0.0.alpha2)
+      activestorage (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      bundler (>= 1.15.0)
+      railties (= 7.0.0.alpha2)
+    railties (7.0.0.alpha2)
+      actionpack (= 7.0.0.alpha2)
+      activesupport (= 7.0.0.alpha2)
+      method_source
+      rake (>= 12.2)
+      thor (~> 1.0)
+      zeitwerk (~> 2.5)
+
+PATH
+  remote: ..
+  specs:
+    importmap-rails (0.8.2)
+      rails (>= 6.0.0)
+
+GEM
+  remote: https://rubygems.org/
+  specs:
+    addressable (2.8.0)
+      public_suffix (>= 2.0.2, < 5.0)
+    appraisal (2.4.1)
+      bundler
+      rake
+      thor (>= 0.14.0)
+    builder (3.2.4)
+    byebug (11.1.3)
+    capybara (3.36.0)
+      addressable
+      matrix
+      mini_mime (>= 0.1.3)
+      nokogiri (~> 1.8)
+      rack (>= 1.6.0)
+      rack-test (>= 0.6.3)
+      regexp_parser (>= 1.5, < 3.0)
+      xpath (~> 3.2)
+    childprocess (4.1.0)
+    concurrent-ruby (1.1.9)
+    crass (1.0.6)
+    erubi (1.10.0)
+    globalid (0.5.2)
+      activesupport (>= 5.0)
+    i18n (1.8.11)
+      concurrent-ruby (~> 1.0)
+    loofah (2.12.0)
+      crass (~> 1.0.2)
+      nokogiri (>= 1.5.9)
+    mail (2.7.1)
+      mini_mime (>= 0.1.1)
+    marcel (1.0.2)
+    matrix (0.4.2)
+    method_source (1.0.0)
+    mini_mime (1.1.2)
+    minitest (5.14.4)
+    nio4r (2.5.8)
+    nokogiri (1.12.5-x86_64-linux)
+      racc (~> 1.4)
+    propshaft (0.3.1)
+      rails (>= 7.0.0.alpha2)
+    public_suffix (4.0.6)
+    racc (1.6.0)
+    rack (2.2.3)
+    rack-test (1.1.0)
+      rack (>= 1.0, < 3)
+    rails-dom-testing (2.0.3)
+      activesupport (>= 4.2.0)
+      nokogiri (>= 1.6)
+    rails-html-sanitizer (1.4.2)
+      loofah (~> 2.3)
+    rake (13.0.6)
+    regexp_parser (2.1.1)
+    rexml (3.2.5)
+    rubyzip (2.3.2)
+    selenium-webdriver (4.1.0)
+      childprocess (>= 0.5, < 5.0)
+      rexml (~> 3.2, >= 3.2.5)
+      rubyzip (>= 1.2.2)
+    sqlite3 (1.4.2)
+    stimulus-rails (0.7.2)
+      rails (>= 6.0.0)
+    thor (1.1.0)
+    turbo-rails (0.8.3)
+      rails (>= 6.0.0)
+    tzinfo (2.0.4)
+      concurrent-ruby (~> 1.0)
+    webdrivers (5.0.0)
+      nokogiri (~> 1.6)
+      rubyzip (>= 1.3.0)
+      selenium-webdriver (~> 4.0)
+    websocket-driver (0.7.5)
+      websocket-extensions (>= 0.1.0)
+    websocket-extensions (0.1.5)
+    xpath (3.2.0)
+      nokogiri (~> 1.8)
+    zeitwerk (2.5.1)
+
+PLATFORMS
+  x86_64-linux
+
+DEPENDENCIES
+  appraisal
+  byebug
+  capybara
+  importmap-rails!
+  propshaft
+  rails!
+  rexml
+  selenium-webdriver
+  sqlite3
+  stimulus-rails
+  turbo-rails
+  webdrivers
+
+BUNDLED WITH
+   2.2.30

lib/importmap/engine.rb

@@ -54,6 +54,9 @@ class Engine < ::Rails::Engine
     end
 
     initializer 'importmap.rescuable_asset_errors' do |app|
+      if defined?(Propshaft)
+        app.config.importmap.rescuable_asset_errors << Propshaft::MissingAssetError
+      end
       if defined?(Sprockets::Rails)
         app.config.importmap.rescuable_asset_errors << Sprockets::Rails::Helper::AssetNotFound
       end

test/dummy/config/application.rb

@@ -5,7 +5,13 @@
 require "active_record/railtie"
 require "action_controller/railtie"
 require "action_view/railtie"
-require "sprockets/railtie"
+begin
+  require "sprockets/railtie"
+rescue LoadError
+  # This is safe to ignore: it's expected that sprockets-rails won't be
+  # available when we're testing against an application that uses rails 7 with
+  # an alternative asset pipeline (e.g. propshaft).
+end
 require "active_storage/engine"
 
 # Require the gems listed in Gemfile, including any gems