@rails/webpacker version

[Baozi2]

I use gem 'webpacker', '>= 4.0.x'. But in my package.json the @rails/webpacker is ^3.5.3.
In the package.json. I think

"webpack": "^3.11.0",
 "webpack-manifest-plugin": "^1.3.2"

should in devDependencies, dependencies

[ytbryan]

I use gem 'webpacker', '>= 4.0.x'. But in my package.json the @rails/webpacker is ^3.5.3.

Have you looked at https://github.com/rails/webpacker#upgrading? In particular "yarn upgrade ..."

should in devDependencies, dependencies

Have you looked at #1208

[humphreybc]

I think running bundle exec rails webpacker:install overwrites the 4.0.x pre-release.

[Footpad]

After commenting out this:

webpacker/lib/install/template.rb

Lines 50 to 51 in 9c46128

	say "Installing all JavaScript dependencies"
	run "yarn add @rails/webpacker"

I was able to get the 4.0.x version of webpacker installed with these:

# Gemfile
gem 'webpacker', '>= 4.0.x'

yarn add @rails/webpacker@4.0.0-pre.2
bundle exec rake webpacker:install

If my understanding is correct, using the specific version in the install task should fix the issue.

[Lasvad]

would upgrading the Webpacker v4 also bring in webpack v4?

[gauravtiwari]

@Lasvad Yes :)

[gauravtiwari]

Made a pre-release (with babel 7 support):

yarn add @rails/webpacker@next
bundle update webpacker