I was trying to communicate between the workers and the master in my brunch plugin, and it triggered an error in brunch.
The problem is that you listen to all messages from the workers without using a namespace (in the initWorker function and you assume that the workers will only send a path:

initWorker = ({changeFileList, compilers, linters, fileList}) ->
  fileList.on 'compiled', (path) ->
    process.send fileList.files.filter (_) -> _.path is path
  process
    .on 'message', (path) ->
      changeFileList compilers, linters, fileList, path
    .send 'ready'

The error is the following:

TypeError: Object # has no method 'match'
at FileList.module.exports.FileList.isIgnored (C:\wamp\www\myProject\node_modules\brunch\lib\fs_utils\file_list.js:76:23)
at C:\wamp\www\myProject\node_modules\brunch\lib\fs_utils\file_list.js:84:28
at Array.some (native)
at FileList.module.exports.FileList.isIgnored (C:\wamp\www\myProject\node_modules\brunch\lib\fs_utils\file_list.js:82:23)
at FileList.module.exports.FileList._change (C:\wamp\www\myProject\node_modules\brunch\lib\fs_utils\file_list.js:216:22)
at FileList._change (C:\wamp\www\myProject\node_modules\brunch\lib\fs_utils\file_list.js:5:61)
at FileList.EventEmitter.emit (events.js:106:17)
at changeFileList (C:\wamp\www\myProject\node_modules\brunch\lib\watch.js:194:21)
at process. (C:\wamp\www\myProject\node_modules\brunch\lib\worker.js:49:14)
at process.EventEmitter.emit (events.js:117:20)
at handleMessage (child_process.js:322:10)
at Pipe.channel.onread (child_process.js:349:11)

Could you add a namespace or some kind of test to avoid this error please ?