grunt uglify不接受lambda或箭头函数

Running "uglify:admin" (uglify) task
{ message: 'SyntaxError: Unexpected token: operator (>)',
  filename: 'admin-app-ng.js',
  line: 4927,
  col: 50,
  pos: 216049,
  stack: 'Error\n    at new JS_Parse_Error (eval at <anonymous>

如果我删除lambda,那么丑陋的功能就会起作用。

这是箭头功能:

myService.getActions($scope.myVar, (type) => (type === 'myType')?true:false);