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Weird errors when using 'brunch watch'

See original GitHub issue

Running brunch build works fine, but when running brunch watch it executes the initial compilation well but when I edit a file and save it brunch throws errors.

When I edit a CSS file I get this error:

R:\project\node_modules\uglify-js-brunch\lib\index.js:50
        data: optimized.code
                       ^
TypeError: Cannot read property 'code' of undefined
    at UglifyMinifier.module.exports.UglifyMinifier.optimize (R:\project\node_modules\uglify-js-brunch\lib\index.js:50:24)
    at R:\project\node_modules\uglify-js-brunch\lib\index.js:3:59
    at generate (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\generate.js:253:12)
    at gen (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\write.js:93:14)
    at C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\node_modules\async-each\index.js:16:7
    at Array.forEach (native)
    at each (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\node_modules\async-each\index.js:15:11)
    at Object.module.exports.write (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\write.js:95:12)
    at C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\watch.js:266:23
    at FileList.<anonymous> (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\watch.js:523:18)
    at FileList.EventEmitter.emit (events.js:92:17)
    at null._onTimeout (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\file_list.js:115:17)
    at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)

When I edit a JS file I get this error:

R:\project\node_modules\uglify-js-brunch\lib\index.js:52
      callback(error, result || data);
      ^
TypeError: string is not a function
    at UglifyMinifier.module.exports.UglifyMinifier.optimize (R:\project\node_modules\uglify-js-brunch\lib\index.js:52:7)
    at R:\project\node_modules\uglify-js-brunch\lib\index.js:3:59
    at generate (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\generate.js:253:12)
    at gen (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\write.js:93:14)
    at C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\node_modules\async-each\index.js:16:7
    at Array.forEach (native)
    at each (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\node_modules\async-each\index.js:15:11)
    at Object.module.exports.write (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\write.js:95:12)
    at C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\watch.js:266:23
    at FileList.<anonymous> (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\watch.js:523:18)
    at FileList.EventEmitter.emit (events.js:92:17)
    at null._onTimeout (C:\Users\myusername\AppData\Roaming\npm\node_modules\brunch\lib\fs_utils\file_list.js:115:17)
    at Timer.listOnTimeout [as ontimeout] (timers.js:110:15)

After errors I have to rerun brunch watch because it gets killed by the error, although it doesn’t make sense because on the next run it crashes again, always.

Any ideas? Thanks!