Error: Cannot find module, but only on Heroku

Question

My application runs just fine locally, and on a Travis CI build server but when its on Heroku

I get Error: Cannot find module and the app crashes.

Some facts about the npm module

• it lives on github
• its a private repo
• its accessed like this "my_module": "git+https://MY_KEY:x-oauth-basic@github.com/me/my_module#develop"

Edit:

It seems that Heroku is erroneously removing my module after the build

-----> Pruning unused dependencies
   unbuild my_module@0.0.7
-----> Caching node_modules directory for future builds

Answer 1

It turns out this was due to my local dev machine (OSX) not being fussy about the casing of file paths whereas Heroku (linux) is.

My module was installed to node_modules/mymodule instead of node_modules/myModule as it should have been.