# Yarn optional dependancies? do I need them? crashing my heroku build **URL:** \ **Category:** Deployment\ **Created:** [January 8, 2021, 12:46am UTC](https://www.ruby-forum.com/t/yarn-optional-dependancies-do-i-need-them-crashing-my-heroku-build/260782 "2021-01-08T00:46:35Z")\ **Posts on this page:** 2\ **Page:** 1
**Author:** ![merlin2049er](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/7feea3/32.png) [@merlin2049er](https://www.ruby-forum.com/u/merlin2049er)\ **Post date:** [January 8, 2021, 12:46am UTC](https://www.ruby-forum.com/t/yarn-optional-dependancies-do-i-need-them-crashing-my-heroku-build/260782/1 "2021-01-08T00:46:35Z")
Trying to deploy on heroku, but it failed and aborted. Only thing I found out was that these yarn optional dependencies are crashing it and are not needed. [2/4] Fetching packages… info fsevents@2.1.3: The platform “linux” is incompatible with this module. info “fsevents@2.1.3” is an optional dependency and failed compatibility check. Excluding it from installation. info fsevents@1.2.13: The platform “linux” is incompatible with this module. info “fsevents@1.2.13” is an optional dependency and failed compatibility check. Excluding it from installation. [3/4] Linking dependencies… rake aborted! Errno::ENOENT: No such file or directory @ dir\_initialize - /tmp/build\_f4389500\_/app/assets/javascripts/libraries Anyone have any idea how to correct this? Thanks, Joe ---
**Author:** ![merlin2049er](https://www.ruby-forum.com/letter_avatar_proxy/v4/letter/m/7feea3/32.png) [@merlin2049er](https://www.ruby-forum.com/u/merlin2049er)\ **Post date:** [January 8, 2021, 1:21am UTC](https://www.ruby-forum.com/t/yarn-optional-dependancies-do-i-need-them-crashing-my-heroku-build/260782/2 "2021-01-08T01:21:08Z")
ok i figured out why it was crashing. I installed hotwire-turbo, but it failed to push the empty library folder over to github - and that crashed heroku. I put a dummy file in there and pushed the folder.