Uglify SyntaxError: Unexpected token: punc ())

Question

I am trying to use gulp in order to minify a folder containing JS files. However, one of the files has the above error, preventing it from being minified.

I managed

Answer 1

I am having the same issue, i found a great answers here that helped me to reach the the file that was causing the error.

Go to Rails Console and Paste:

JS_PATH = "app/assets/javascripts/**/*.js";
Dir[JS_PATH].each do |file_name|
  puts "\n#{file_name}"
  puts Uglifier.compile(File.read(file_name))
end

Hope it helps someone!

Answer 2

If you got this error using Grunt (grunt-contrib-uglify) the solution is to install ES6 version of the plugin:

npm install grunt-contrib-uglify-es --save-dev