Esbuild: Command line option to treat all files as .jsx?

[sesam]

As a curious developer,
In order to try out esbuild on an existing project,
I'd like to be able to run esbuild without first renaming a lot of files.

Given that the React projects I've seen so far used .js everywhere (because for .jsx other tools just didn't work), would a command line option be very bad? It could be named --accept-slowdown-treat-all-js-as-jsx :) or maybe just --jsx or something?

[evanw]

Yes, this is a good idea. I'm actually already planning on doing this. I'm planning to have a hard-coded set of loaders built into the executable, which can then be overridden per file extension. This is a more general-purpose mechanism that will also be helpful for other loaders. For example, you may want to have each .png file loaded as a base64 string. I'm not sure what the exact syntax will be yet.

[sesam]

So, for the parameter format, what are some options? Does any tool do this already? Is this something akin to a babel-ish preset? One cool approach could be ~--go,go,FILENAME-gadget~ ehm... --use=jsx and that goes and fetches from the git repo and caches jsx.esbuild.yml from then on. And the yml can contain various things. Too much too soon? :)