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progapandist/webpacker_troubles.md

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webpacker_troubles.md

Fixing Webpacker 3.3.0 + Rails 5.1.5

Heroku hosting trouble

Heroku may not detect a correct buildpack for your JS dependencies, then you have to set it manually:

heroku buildpacks:add heroku/nodejs -i 1
heroku buildpacks:add --index 2 https://github.com/heroku/heroku-buildpack-ruby

Execute line-by-line (don't cut&paste the whole block!) and then try git push heroku master again.

Rails can't find the manifest file

Run webpack-dev-server in a separate tab next to rails s

webpack-dev-server is not running

If the webpack-dev-server refuses to run, you might want to downgrade it, run yarn upgrade -D webpack-dev-server@^2.11.1. If it insists on installing a webpack-cli — do as the prompt tells you.

environment.js is broken

There's been an API change for Webpacker environment setup (to add jQuery as a global dependency, for instance). Change the line environment.plugins.set to environment.plugins.prepend while keeping the rest intact

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