Webpacker: ERROR: directory is already being watched!

[lauri865]

On the latest build (4.0.0-pre.3), I get the following error on OS X 10.14 (Mojave):

`* ERROR: directory is already being watched! *

    Directory: /Users/user/dev/userapp/node_modules/@rails/webpacker/node_modules/.bin/mini-css-extract-plugin

    is already being watched through: /Users/name/dev/app/node_modules/mini-css-extract-plugin

    MORE INFO: https://github.com/guard/listen/wiki/Duplicate-directory-errors
    ** ERROR: directory is already being watched! **

    Directory: /Users/name/dev/userapp/node_modules/@rails/webpacker/node_modules/.bin/file-loader

    is already being watched through: /Users/user/dev/userapp/node_modules/file-loader`

Can't seem to figure out the root cause of it – any ideas? Thanks!

[lauri865]

Managed to debug, and get rid of it.

Reason the symptom revealed itself: new version of file-loader dep symlinks to its bin insider webpacker

Root cause: a directory defined within autoload paths (in my case test/mailers/previews) was missing, and instead of skipping that directory, the root of my rails project was watched through ActiveSupport::EventedFileUpdateChecker

[zernie]

@lauri865 that sounds like a rails bug

[gauravtiwari]

Please use the latest RC, and feel free to open a new issue with more details if this is still an issue.

[yoshiakit]

I've had a similar situation and modifying the config.file_watcher (see below) works for me:

# /config/environments/development.rb
 config.file_watcher = ActiveSupport::FileUpdateChecker