July 2, 2024

Subject: ECMAScript 2024; new Set methods; JS performance initiative; rounding errors; benchmarking tool; JSNation 2024 videos; Rolldown v0.10.5; oxlint v0.5.0

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Ecma International approves ECMAScript 2024: What’s new?

2ality.com @rauschma@fosstodon.org

For each of the following new features, there is a brief explanation, a code example and a link to a longer explanation:
  • Grouping synchronous iterables
  • Promise.withResolvers()
  • Regular expression flag /v
  • New features for ArrayBuffers and SharedArrayBuffers
  • Ensuring that strings are well-formed
  • Atomics.waitAsync()

The JavaScript Set methods are now part of Baseline

web.dev @tropicadri@hachyderm.io

The following new Set methods (a feature that will be part of ECMAScript 2025) are now available in all major browsers:
  • Set.prototype.union(other)
  • Set.prototype.intersection(other)
  • Set.prototype.difference(other)
  • Set.prototype.symmetricDifference(other)
  • Set.prototype.isSubsetOf(other)
  • Set.prototype.isSupersetOf(other)
  • Set.prototype.isDisjointFrom(other)
A 2ality blog post covers these methods in more detail.

e18e (Ecosystem Performance): creating a community dedicated to JavaScript performance

e18e.dev @e18e@m.webtoo.ls

Quoting the e18e website:
  • e18e (Ecosystem Performance) is an initiative to connect the folks and projects working to improve JS packages performance.
  • We’d also like to provide visibility to the efforts of countless Open Source developers working to cleanup, levelup, and speedup our dependencies.
  • We invite you to get involved in the different projects linked from these pages, and to connect with others like-minded folks.

Handling JavaScript rounding errors in financial applications

www.robinwieruch.de github.com/rwieruch

ESBench: modern JavaScript benchmarking tool

esbench.vercel.app github.com/ESBenchmark

Videos of JSNation 2024 talks are online

portal.gitnation.org @gitnationorg@techhub.social

New versions

Rolldown v0.10.5: bundling TypeScript and more

github.com @hyf@webtoo.ls github.com/rolldown

Oxlint v0.5.0: new linting rules for JavaScript and TypeScript

github.com github.com/oxc-project

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