Summary & Key Takeaways ​

• Google has open-sourced JSIR, a new high-level Intermediate Representation for JavaScript, intended to form a foundation for next-generation tooling.
• WebKit, Google, and Mozilla have jointly unveiled JetStream 3, the latest version of their browser-oriented JavaScript and WASM performance benchmarks.
• The issue includes an "up-to-date overview of the JS landscape," covering ECMAScript additions, frameworks, runtimes, and build tools.
• Other notable mentions include a postmortem of an npm supply chain compromise and Cloudflare's release of EmDash, a JavaScript-flavored "spiritual successor to WordPress."
• ESLint v10.2.0 adds support for language-aware rules, and Node.js 25.9.0 introduces --max-heap-size and an experimental iterable streams API.

Our Commentary ​

JavaScript Weekly always delivers a packed issue, and this one is no exception. Google's JSIR is a fascinating, albeit long-term, development. It's the kind of foundational work that could quietly revolutionize our tooling down the line, making linters and bundlers even smarter. And JetStream 3? That's a big deal for browser performance nerds like us. It's a good snapshot of where the ecosystem is heading, with a mix of deep technical advancements and practical updates. We're particularly intrigued by Cloudflare's EmDash – a "spiritual successor to WordPress" built with JS sounds ambitious!