“Unexpected token: punc ())” when building for production

Question

If I try to test-build my application with ng build --prod --aot I get the following, quite short, error message:

$ ng build --prod
                      


        

Answer 1

I had the same problem and found out it was caused by https://www.npmjs.com/package/url-parameter-append

There was an extra comma after a list of parameters in a function call

I removed the comma in my own copy of url-parameter-append.js and then it worked.

I reported the bug to the author of that package https://github.com/techinity/url-parameter-append/issues/10 , but really IMO the bug is

• in the way angular build reports errors
• in "Terser": an extra comma after a list of parameters is legit in js/ts.