Cannot minify JavaScript file contains a bare Unicode escape identifier

[makenowjust]

The following JavaScript source code seems odd, but it is completely legal. (See ECMA-262)

const _\u00bare_unicode_escape_identifier = 42;
console.log(_\u00bare_unicode_escape_identifier);

And, such a source code is generated by Scala.js.

When Hugo tries to minify a source containing a bare Unicode escape identifier, it shows the following error:

Start building sites …
hugo v0.89.4+extended darwin/amd64 BuildDate=unknown
Error: Error building site: MINIFY: failed to transform "index.js" (application/javascript): unexpected \u00BAre_unicode_identifier in var statement on line 3 and column 8
    3:   var _\u00BAre_unicode_identifier = 42;
              ^

Noting that the latest ESBuild supports minifying source codes with a bare Unicode escape identifier, I think this problem is solved if ESBuild is updated.

What version of Hugo are you using (hugo version)?

$ hugo version
hugo v0.89.4+extended darwin/amd64 BuildDate=unknown

Does this issue reproduce with the latest release?

Yes

[pamubay]

Just tried minification using esbuild using js.Build function, it works. But it doesnt work if you are using minify or resources.Minify.

minify or resources.Minify minification function is handled by tdewolff/minify.

If you want to use esbuild to handle minification, you need to set it on js.Build options

{{- $jsOpts := dict "minify" true -}}
{{- $js := resources.Get "js/script.js" | js.Build $jsOpts }}
<script src="{{ $js.Permalink }}"></script>     

Hugo Version:

hugo v0.90.0-DEV-75A823A3+extended linux/amd64 BuildDate=2021-11-26T11:59:58+0700

[makenowjust]

Thanks for clarification.

I will use esbuild to minify, and will open a new issue on tdewolff/minify.

[github-actions]

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