webpackerをインストールしてると
単純に
これでいけた。
assets:precompileでwebpackerの処理も動く。単純に
assets:precompileだけ動かしたかったので方法がないか調べた。これでいけた。
rm bin/yarn WEBPACKER_PRECOMPILE=false bin/rails assets:precompile
確認したバージョン:
- rails 6.1.4
- webpacker 5.4.0
以下調査ログ。
普通に実行してみる:
❯ bin/rails assets:precompile
yarn install v1.22.10
[1/4] 🔍 Resolving packages...
success Already up-to-date.
✨ Done in 0.19s.
Compiling...
Compiled all packs in /Users/okonomi/src/local/rails-webpacker-sandbox/public/packs
Hash: e4cb1aa40fed2663ee2c
Version: webpack 4.46.0
Time: 446ms
Built at: 2021/06/29 21:03:08
Asset Size Chunks Chunk Names
js/application-c3e3aae48c4c321181e9.js 69.4 KiB 0 [emitted] [immutable] application
js/application-c3e3aae48c4c321181e9.js.br 15.4 KiB [emitted]
js/application-c3e3aae48c4c321181e9.js.gz 17.8 KiB [emitted]
js/application-c3e3aae48c4c321181e9.js.map 205 KiB 0 [emitted] [dev] application
js/application-c3e3aae48c4c321181e9.js.map.br 43.8 KiB [emitted]
js/application-c3e3aae48c4c321181e9.js.map.gz 50.9 KiB [emitted]
manifest.json 364 bytes [emitted]
manifest.json.br 133 bytes [emitted]
manifest.json.gz 142 bytes [emitted]
Entrypoint application = js/application-c3e3aae48c4c321181e9.js js/application-c3e3aae48c4c321181e9.js.map
[0] (webpack)/buildin/module.js 552 bytes {0} [built]
[4] ./app/javascript/packs/application.js 480 bytes {0} [built]
[5] ./app/javascript/channels/index.js 205 bytes {0} [built]
[6] ./app/javascript/channels sync _channel\.js$ 160 bytes {0} [built]
+ 3 hidden modulesyarn installのあとwebpack compileが動いてる。
どんなrakeタスクが動いてる確認する:
❯ bin/rails assets:precompile --trace ** Invoke assets:precompile (first_time) ** Invoke assets:environment (first_time) ** Execute assets:environment ** Invoke environment (first_time) ** Execute environment ** Invoke yarn:install (first_time) ** Execute yarn:install yarn install v1.22.10 [1/4] 🔍 Resolving packages... success Already up-to-date. ✨ Done in 0.19s. ** Execute assets:precompile ** Invoke webpacker:compile (first_time) ** Invoke webpacker:verify_install (first_time) ** Invoke webpacker:check_node (first_time) ** Execute webpacker:check_node ** Invoke webpacker:check_yarn (first_time) ** Execute webpacker:check_yarn ** Invoke webpacker:check_binstubs (first_time) ** Execute webpacker:check_binstubs ** Execute webpacker:verify_install ** Invoke environment ** Execute webpacker:compile Everything's up-to-date. Nothing to do
yarn:installとかwebpacker系のタスクが動いてる。webpackerのタスクは環境変数でスキップできる。
https://github.com/rails/webpacker/blob/master/CHANGELOG.md#added-gem-1
❯ env WEBPACKER_PRECOMPILE=false bin/rails assets:precompile --trace ** Invoke assets:precompile (first_time) ** Invoke assets:environment (first_time) ** Execute assets:environment ** Invoke environment (first_time) ** Execute environment ** Invoke yarn:install (first_time) ** Execute yarn:install yarn install v1.22.10 [1/4] 🔍 Resolving packages... success Already up-to-date. ✨ Done in 0.19s. ** Execute assets:precompile
yarn:installがどこから呼ばれるのかソースコードを検索:❯ grep -r "yarn:install" .bundle/ruby/3.0.0/gems .bundle/ruby/3.0.0/gems/railties-6.1.4/lib/rails/tasks/yarn.rake: Rake::Task["assets:precompile"].enhance [ "yarn:install" ] .bundle/ruby/3.0.0/gems/webpacker-5.4.0/docs/engines.md: # yarn:install was added in Rails 5.1 .bundle/ruby/3.0.0/gems/webpacker-5.4.0/lib/tasks/webpacker/compile.rake: # yarn:install was added in Rails 5.1
railtiesの
lib/rails/tasks/yarn.rakeを見る:# Run Yarn prior to Sprockets assets precompilation, so dependencies are available for use.
if Rake::Task.task_defined?("assets:precompile") && File.exist?(Rails.root.join("bin", "yarn"))
Rake::Task["assets:precompile"].enhance [ "yarn:install" ]
endassets:precompileタスクが定義されているのとbin/yarnが存在する場合にyarn:installが呼ばれるようになってる。bin/yarnを消してみる:❯ rm bin/yarn ❯ WEBPACKER_PRECOMPILE=false bin/rails assets:precompile --trace ** Invoke assets:precompile (first_time) ** Invoke assets:environment (first_time) ** Execute assets:environment ** Invoke environment (first_time) ** Execute environment ** Execute assets:precompile
yarn:installが呼ばれなくなった！まとめ
webpackerをインストールしてるrailsアプリで単純に
assets:precompileだけ動かしたい場合は、以下のようにする:-
bin/yarnを削除する - 環境変数
WEBPACKER_PRECOMPILE=falseを設定する
備考
rails 6.0だと
https://github.com/rails/rails/blob/6-0-stable/railties/lib/rails/tasks/yarn.rake
bin/yarnの存在チェックはなかった:https://github.com/rails/rails/blob/6-0-stable/railties/lib/rails/tasks/yarn.rake
# Run Yarn prior to Sprockets assets precompilation, so dependencies are available for use.
if Rake::Task.task_defined?("assets:precompile")
Rake::Task["assets:precompile"].enhance [ "yarn:install" ]
end
