Issues with Google Closure Compiler and modern JavaScript

It seems that XWiki uses the Google Closure Compiler to minify JavaScript.

Also, it seems that Google Closure Compiler does not support modern JavaScript syntax completely (please have a look on the "no"s at the bottom of this page: Link). 

At least, if I use a JavaScript class with private member (=> "private" means, the name of the member starts with "#"), the Google Closure Compiler seems to have problems with that and logs error messages like the following (here the privat member was called #getLocale):

2025-07-14 05:39:44,591 [qtp107456312-42 - http://localhost:8080/xwiki/bin/jsx/xwiki-tools/WebHome?language=en&docVersion=59.4] ERROR c.x.x.w.s.JsExtension          - Error at line [50], column [11]: [Parse error. 'identifier' expected]
Jul 14, 2025 5:40:15 AM com.google.javascript.jscomp.LoggerErrorManager println
SEVERE: xwiki:xwiki-tools.WebHome:50:11: ERROR - [JSC_PARSE_ERROR] Parse error. 'identifier' expected
  50|       this.#getLocale = getLocale;
                 ^

Jul 14, 2025 5:40:15 AM com.google.javascript.jscomp.LoggerErrorManager printSummary
WARNING: 1 error(s), 0 warning(s) 

If my interpretations are wrong, please let me know.
Otherwise, is there anything I can do against those errors (except for refraining from using modern JavaScript features)?

Maybe, a solution could be that XWiki will use some other tool to minify JavaScript (for example "terser" or whatever).

Thank you very much.