ExecJS::ProgramError: Unexpected token punc «(», expected punc «:» when running rake assets:precompile on production

Question

When deploying my Rails app I get the following error:

rake aborted!
   ExecJS::ProgramError: Unexpected token punc «(», expected punc «:» (line: 15, col: 14         


        

Answer 1

In my case problem with function definition like,

function someFunctionName(param1, param2=defaultValue){
  //code 
}

Due to above function definition I was getting error, as it is not supported by Uglifier. Default parameters is ES6/ES2015 language specification.

For solution to above problem you can refer Set a default parameter value for a JavaScript function