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@jdalton @sindresorhus @rauschma @IgorMinar @TheLarkInn @kentcdodds @dan_abramov @Rich_Harris Hello fellow open source publishing/bundling folks... I want to start a public discussion about the current "state of the art" for libraries publishing JavaScript modules... 1/6

Basically, RxJS is going to undergo (mostly cosmetic) changes over these next few months, and I think it's a good time for us to revisit our strategy for publishing different module types. 2/6

Currently, RxJS is publishing: ESM5, ESM2015, CJS, and a single "kitchen-sync" UMD (for classic global script-tag style imports), as well as TypeScript source files for source mapping. Honestly, it's a little out of control. 3/6

In your _opinion_, where are we headed? When will be the proper time to just publish ESM2015 (with extensions or whatever we need to do) and forgo building CJS/ESM5 etc? 4/6

With the advent of things like @codesandbox, @stackblitz, and @unpkg, is it even necessary that we publish big UMD globals anymore? 5/6

UMD hasn’t been necessary for years. just publish es5 cjs main, and optionally ESM if you really want to