Unexpected token: eof (undefined) error when running task

[vivekkodira1]

The error and stack trace are below.
Observations:

1. If I open and edit the file (any change at any location) and then re-rerun, the task completes without exceptions.
2. There is no content at the identified location other than a few line-breaks

M/c: mac

{ message: 'Unexpected token: eof (undefined)',
  filename: 'cloudmunch.js',
  line: 28474,
  col: 0,
  pos: 1071559,
  stack: 'Error
  at new JS_Parse_Error (<anonymous>:1526:18)
  at js_error (<anonymous>:1534:11)
  at croak (<anonymous>:2026:9)
  at token_error (<anonymous>:2034:9)
  at unexpected (<anonymous>:2040:9)
  at block_ (<anonymous>:2352:28)
  at eval (<anonymous>:2326:25)
  at function_ (<anonymous>:2331:15)
  at expr_atom (<anonymous>:2546:24)
  at maybe_unary (<anonymous>:2716:19)
  at expr_ops (<anonymous>:2751:24)
  at maybe_conditional (<anonymous>:2756:20)
  at maybe_assign (<anonymous>:2780:20)
  at expression (<anonymous>:2799:20)
  at expr_list (<anonymous>:2565:24)
  at subscripts (<anonymous>:2699:30)
  at expr_atom (<anonymous>:2552:20)
  at maybe_unary (<anonymous>:2716:19)
  at expr_ops (<anonymous>:2751:24)
  at maybe_conditional (<anonymous>:2756:20)
  at maybe_assign (<anonymous>:2780:20)
  at expression (<anonymous>:2799:20)
  at simple_statement (<anonymous>:2240:55)
  at eval (<anonymous>:2113:19)
  at eval (<anonymous>:2073:24)
  at eval (<anonymous>:2827:23)
  at Object.parse (<anonymous>:2837:7)
  at /Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt-contrib-uglify/tasks/lib/uglify.js:54:27
  at Array.forEach (native)
  at Object.exports.minify (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt-contrib-uglify/tasks/lib/uglify.js:37:11)
  at /Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt-contrib-uglify/tasks/uglify.js:156:25
  at Array.forEach (native)
  at Object.<anonymous> (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt-contrib-uglify/tasks/uglify.js:77:16)
  at Object.<anonymous> (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/grunt/task.js:264:15)
  at Object.thisTask.fn (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/grunt/task.js:82:16)
  at Object.task.fn (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/jit-grunt/lib/jit-grunt.js:122:30)
  at Object.<anonymous> (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/util/task.js:301:30)
  at Task.runTaskFn (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/util/task.js:251:24)
  at Task.<anonymous> (/Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/util/task.js:300:12)
  at /Users/vivekkodira/cloudmunch/cloudmunch-ui/node_modules/grunt/lib/util/task.js:227:11
  at process._tickCallback (node.js:355:11)

[avdg]

Maybe it's better to do that hack for now, if you can send the "corrupt" file.

Pls upload on gist.github.com or so on case someone wants to digg in or when we get more of these issues. Then the bug is at least somewhat documented.

[vivekkodira1]

Unfortunately, I won't be able to upload the code since it is proprietary. I was able to come up with another workaround to solve the problem. Documenting it here just in case someone else needs it.

I added a lineending task before invoking uglify to explicitly convert the line endings. Now uglify runs without issues.

[avdg]

hmm it's a bit weird that an error occurs while parsing in a block, bug seems to be uglifyjs side though

(or after concatenating multiple files)

[vivekkodira1]

Yes. I am concatenating multiple files before running uglify.

[Arkni]

I have seen something like this before. The problem was the grunt-contrib-concat that use CRLF on windows and that cause JSCS to throw a code style error (Invalid line break at ...). So as a solution, you can set grunt.util.linefeed to LF in your Gruntfile:

grunt.util.linefeed = "\u000A";

[edipox]

In case someone is here because of the uglifyjs error:

Build Error (UglifyWriter)
Unexpected token: eof (undefined)

I got this same error using ember. The solution was to update ember-cli-moment-shim to version v3.8.0