Support ESBuild options JSXImportSource and JSX

[baltpeter]

Hugo already has support for passing the JSXFactory and JSXFragment options to ESBuild:

hugo/resources/resource_transformers/js/options.go

Lines 416 to 417 in 16406d9

	JSXFactory: opts.JSXFactory,
	JSXFragment: opts.JSXFragment,

These are unfortunately pretty unergonomic when using Preact. If I use the options "JSXFactory" "h" "JSXFragment" "Fragment", I have to prepend an (otherwise unused) import { h, Fragment } from 'preact'; before every JSX file.

It would probably be possible to work around that using inject, but ESBuild has two newer options that don't require such workarounds anymore, JSXImportSource and JSX: https://esbuild.github.io/api/#jsx-import-source

I would appreciate if it was possible to set these through Hugo. Currently, the only way I've seen to set these would be on a per-file level like this:

// @jsxImportSource preact
// @jsxRuntime automatic

If there is interest in supporting those two options, I'm happy to submit a PR. Thanks!

[bep]

I'm happy to submit a PR. Thanks!

Please do.

[github-actions]

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