Way to just update relative url() when bundling CSS, don't move file - Propose "update-path" loader command line option

[samwillis]

Currently when bundling CSS if you only want to update the relative path in the url() and not move the file you have to use the plugin api as in: https://github.com/evanw/esbuild/issues/800.

I'm building a tool for Python/Django developers and my intention is that they will not need to setup a node.js environment to use it[^1]. What I would love would be a built in update-path loader, so you could pass an argument to the command line such as --loader:.png=update-path or even better a way to pass a "ResolveKind" to the option, such as --loader:[url-token]=update-path.

Using --external:*.png is not an option as it does not update the relative path, leaving it as is.

Would something like this be possible?

(P.s. esbuild is incredible!)

[^1]: It will automatically download the correct esbuild binary for their os/platform.