I'd like to make a preset for Ruby2JS. Many compiler/transpiler tools offer a "preset-env" configuration or something like that which is a sane set of defaults good for most projects. It means a lot of code which would be shared or reused across projects will work as expected.

As a starting point, I'm thinking a modern eslevel (likely to be further transpiled by a bundler like esbuild if need be), along with the functions filter, return, and esm. The current "default" without any of those switched on is virtually unusable IMHO, so that's not a good out-of-the-box experience.

This is a good third-party "review" of Ruby2JS outlining some of these issues:
https://dev.to/taw/open-source-adventures-episode-62-ruby2js-119i