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Thank you for the well thought out answer. This is why I asked.

This was brought to my attention working on a new project. This is the first time I've done rails 6 on heroku. Heroku out of the box with this app gives me a ~360mb buildpack; this exceeds their soft limit of 300mb. Historically not been an issue for me but I guess now with webpack, I need to customize the buildpack to cleanup the node_modules after compilation.

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No problem! FYI there may be something else bloating your slug. With the ruby buildpack, heroku by default will install node_modules to a shared cache directory and not include them in the slug artifact. For example I have a Rails app that has 250MB of node_modules locally but my slug on Heroku is only 93.4MB.

Good to know, Ill keep digging on the heroku side.

Actually, I guess I was wrong about node_modules not being included in the slug -- it's just that the slug is compressed so node_modules don't take up anything close to their stat size. One common gotcha is that if you have large non-code files in your git repo (binaries/images/gzips/etc), those will end up in your slug and they don't compress well so they'll add a lot of bloat. If that's the case you can use a .slugignore file[0] to tell Heroku to exclude them. Good luck!

[0]: https://devcenter.heroku.com/articles/slug-compiler#ignoring...

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