You spend too much time to deploy your rails project especially on the assets:precompile step, or maybe sometimes you see the following error during the assets precompilation:

FATAL ERROR: Ineffective mark-compacts near heap limit Allocation failed - JavaScript heap out of memory

So for sure, this short article will help you to have 50% improvement only with some minor changes.

---

If you’re using webpacker in your project, the assets:precompile consists of two stages; we will call these two stages, sprockets and webpacker. Now we want to execute these two stages separately to find out which one is your problem.

Run sprockets stage:

WEBPACKER_PRECOMPILE=false rake assets:precompile

and then run webpacker building stage:

rake webpacker:compile

NOTE:_ If you want to analyze the performance of the above commands in production mode, pass _RAILS_ENV=production_ as an environment variable to both of them._

If the webpacker is your main problem, keep reading and we are going to investigate and resolve the issue. There is a way to see the details of webpacker compile command, in order to that we should use webpack itself instead of webpacker:

./bin/webpack --progress

#deployment #webpacker #ruby-on-rails #webpack