js_out with import_style=closure is incompatible with grpc-web_out import_style=typescript

[bpicolo]

Not sure what the best resolution is, but should probably raise an error if attempting to use these two together, especially given closure is the default import style.

This note in the documentation was also hard to catch:
Note: commonjs+dts and typescript only works with --grpc-web_out= import style.

Could attempting to use js_out with an unsupported import style also error out?

[pumano]

Yes, defferent import styles. I add that "note" to documentation because I found that problem too. Just use commonjs as js_out and typescript for grpc_out.

I use commonjs for js_out and commonjs+dts for grpc-web_out. It works good.