こいつ参考に、少し違ったとこを
rails webpacker:install Webpacker requires Node.js >= 6.0.0 and you are using 5.7.0 Please upgrade Node.js https://nodejs.org/en/download/
nodeバージョン違うerror出たので
nodebrew install-binary v6.1.0 nodebrew use v6.1.0 rails webpacker:install
rails webpacker:install:vue bin/webpack-dev-server
またエラーが出る
Your `bin/bundle` was not generated by Bundler, so this binstub cannot run. Replace `bin/bundle` by running `bundle binstubs bundler --force`, then run this command again.
言われた通りに実行
bundle binstub bundler --force The git source `git://github.com/rails/webpacker.git` uses the `git` protocol, which transmits data without encryption. Disable this warning with `bundle config git.allow_insecure true`, or switch to the `https` protocol to keep your data secure.
アクセスするとまたエラー
undefined method `javascript_pack_tag' for #<#<Class:0x00007fe00d49a9b8>:0x00007fe00d498500>
rails再起動すると出るように出来た
参考
