Backport #29303 by @silverwind So we don't get issues like https://github.com/go-gitea/gitea/issues/29080 and https://github.com/go-gitea/gitea/issues/29273 any more. Only active in [production builds](https://webpack.js.org/guides/production/#specify-the-mode), in non-production the errors will still show. Co-authored-by: silverwind <me@silverwind.io>
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