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railsアプリをherokuにデプロイしようとして、 error Command "webpack" not found.が出た時の対処法

Last updated at Posted at 2022-12-16

結論

・webpackerを最新のものにする

エラーが出た時のGemfileはこんな感じでした。

Gemfile

gem 'webpacker', '~> 4.0'

それを

gem 'webpacker', '~> 5.0'

に変更して

bundle update
bundle install
bundle exec rails webpaker:install

この時にconflictが出る時がありますが、それは全部yを入力して無視して大丈夫でした。

ここまできたら再度herokuにデプロイ。

git add -A
git commit -m "update webpacker"
git push
git push heroku main:main

これで解決。

参考サイト

Rails 'error Command "webpack" not found.'について

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