future and esm interop

[pocesar]

now that es modules are officially here, what is the future of ES Module Loader (and therefore, SystemJS and JSPM)? I've been using JSPM for a long time, since the 0.17 came around, but need to think forward on the current and future states of things

[guybedford]

The future focus of the SystemJS project is on the production loader, which is a small loader supporting loading System.register modules, WASM, AMD and globals.

The idea then is that browsers that support ES modules are fine - but if you need to load other module formats, or support older browsers, using the SystemJS production loader can provide this experience.

Also Rollup integration with SystemJS has been a big focus - Rollup now supports the System module format, so that ES modules can be optimized with the new code splitting feature in Rollup and loaded with the SystemJS production loader alongside CDN resources - read https://rollupjs.org/guide/en#experimental-code-splitting for more info.