purs-loader: Module not found errors of index.js and foreign.js

I’ve attempted to predominantly mimic the example you link, but am at a total loss after several hours as to why it is trying to require files with these names in the first place.

From what I understand this is going wrong internally within webpack when it’s attempting to “require” the files resulting from compilation. My suspicion is that because the purescript compiler for 0.12 outputs compiled files to a separate “output” folder, which then isn’t resolving.

If I find the solution I’ll add it here, and you can lose the issue, but at least a closed issue might help the next person who loses their mind like me 💃

Here’s a few examples:

ERROR in ./bower_components/purescript-prelude/src/Data/Ord.purs
Module not found: Error: Can't resolve '../Data.Ordering/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/Ord.purs 6:20-56
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/Ord/Unsafe.purs
Module not found: Error: Can't resolve '../Data.Ordering/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data/Ord'
 @ ./bower_components/purescript-prelude/src/Data/Ord/Unsafe.purs 4:20-56
 @ ./bower_components/purescript-prelude/src/Data/Ord.purs
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Prelude.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src'
 @ ./bower_components/purescript-prelude/src/Prelude.purs 24:16-48
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/Field.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/Field.purs 6:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/CommutativeRing.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/CommutativeRing.purs 3:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/Ord.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/Ord.purs 7:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/DivisionRing.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/DivisionRing.purs 4:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/EuclideanRing.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/EuclideanRing.purs 8:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/Function.purs
Module not found: Error: Can't resolve '../Data.Ring/index.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data'
 @ ./bower_components/purescript-prelude/src/Data/Function.purs 6:16-48
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Data/Ord/Unsafe.purs
Module not found: Error: Can't resolve './foreign.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Data/Ord'
 @ ./bower_components/purescript-prelude/src/Data/Ord/Unsafe.purs 3:15-38
 @ ./bower_components/purescript-prelude/src/Data/Ord.purs
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs

ERROR in ./bower_components/purescript-prelude/src/Record/Unsafe.purs
Module not found: Error: Can't resolve './foreign.js' in '/home/alexa/Workspace/my-selfcare-client/bower_components/purescript-prelude/src/Record'
 @ ./bower_components/purescript-prelude/src/Record/Unsafe.purs 3:15-38
 @ ./bower_components/purescript-prelude/src/Data/Eq.purs
 @ ./bower_components/purescript-prelude/src/Prelude.purs
 @ ./src/App.purs
 @ multi (webpack)-dev-server/client?http://localhost:4008 webpack/hot/dev-server ./src/App.purs