Hello,
when I am running solution checks , it returns some JavaScript errors some them are critical.
do these errors need to be fixed?
or we can ignore ?
Thanks,
What are the critical issues?
In general you should try to fix critical or high severity issues in javascript, but there isn't going to be anything that prevents you from deploying that solution. Caveat: if you are in a managed environment and using pipelines for deployment, the admin can require you to fix certain solution checker issues.
If there is a good reason you can't fix a critical issue, then sure deploy it. Otherwise you can share the issue and code and we can try to find a workaround.