Automatically bundle ESM only dependencies

[dalmaer]

We are in a messy world with npm and CJS/ESM. As we see more packages switch over to ESM, we sometimes update a dependency and something breaks.

Often the solution is just: add the package to serverDependenciesToBundle. There is a nice warning that you often see, you make the change, and you are golden.

You can also just set serverDependenciesToBundle to all which is great if you are in the lovely ESM future where no CJS exists, but could we offer another solution?

Either by default, or explicitly by setting serverDependenciesToBundle to auto results in the compiler automatically bundling if the esmOnly check it true. The infra is all there as we warn on it.

We could change this to:

if (remixConfig.serverDependenciesToBundle === "auto" &&
     !isNodeBuiltIn(packageName) &&
     kind !== "dynamic-import" &&
     remixConfig.serverPlatform === "node") {
     return undefined;
}

If we find that this is working well we could default to this vs. auto.

[dalmaer]

After chatting with Michael and others, instead of implementing this, we thought it would be better to flip to ESM-first once we stop supporting node < 18.