Just released v0.4.0 of esbuild, an extremely fast JavaScript bundler

New in this release:
- ES module output
- Performance improvements
- Preliminary tree shaking support
- Updated benchmarks (esbuild is now ≥100x faster than other bundlers)

More info: https://github.com/evanw/esbuild 
Full release notes: https://github.com/evanw/esbuild/blob/master/CHANGELOG.md#040.

More improvements to tree shaking are coming. Issue: https://github.com/evanw/esbuild/issues/50.

Code splitting didn't make the cut for this release. The foundation is there and it will be coming in a future release. Issue: https://github.com/evanw/esbuild/issues/16.
[Feature] Code splitting on async import() statements. · Issue #16 · evanw/esbuild

Support code splitting on dynamic import() statements, and additionally split/join on shared bundles for shared dependency models.

https://github.com/evanw/esbuild/blob/master/CHANGELOG.md#040
This release has a lot of new code. The bundler has been mostly rewritten.

While I've already tested it a ton, more tests are always helpful. Please let me know on GitHub if you find any issues!
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