ReferenceError: $jscomp is not defined

Hello! I’ve downloaded the most recent version of compiler and i’ve tried to optimize js code with these flags: java -jar closure-compiler-v20211006.jar -W VERBOSE -O WHITESPACE_ONLY --language_out ECMASCRIPT5 $script_path_in --js_output_file $script_path_tmp

closure compiler has optimized this lines of code:

for(var extraProperty of extraProperties){
		option.setAttribute(extraProperty,initialOption[extraProperty]);
	}

into

 for (var $jscomp$iter$0 = $jscomp.makeIterator(extraProperties), $jscomp$key$extraProperty = $jscomp$iter$0.next(); !$jscomp$key$extraProperty.done; $jscomp$key$extraProperty = $jscomp$iter$0.next()) {
        var extraProperty = $jscomp$key$extraProperty.value;
        {
            option.setAttribute(extraProperty, initialOption[extraProperty])
        }
    }

And as a result i receive such error in browser: all_compressed.js Uncaught ReferenceError: $jscomp is not defined

[roman01la]

The problem described in the original post is that we really shouldn’t allow both WHITESPACE_ONLY mode and transpilation. That’s a contradiction. If you’re transpiling, then you’re not changing only whitespace.

I believe @blickly is working on a change that will adapt WHITESPACE_ONLY to automatically disable transpilation.

@brad4d was that implemented already? We are hitting the same issue in ClojureScript (which relies on Closure) where $jscomp is undefined when language out is set to es5. Is there a workaround that doesn’t involve setting optimizations to simple? We’ve started seeing it after upgrade of Closure from v20210505 to v20220601

[stigi]

@brad4d Here’s a repository demoing a tiny reproduction case for the issue @roman01la mentioned. In our case the issue seems to be rooted in ES6 classes that extend from other classes and $jscomp.inherits being undefined: https://github.com/stigi/clojurescript-es5-issue