JavaScript Weekly Issue 741: June 20, 2025

📖 Exploring JavaScript (ES2025 Edition) — Dr. Axel is back with his latest book covering all things relating to modern JavaScript at the language level (think built-in data types, modularity, how objects, classes and promises work, etc.). As with all of Axel’s books, it’s available to buy but also to read online in HTML form for free. He’s also produced a set of flashcards to help you learn language features in both HTML and Anki forms.

Dr. Axel Rauschmayer

💡 The two sets of flashcards (including API flashcards) are worth a look on their own as you’ll almost certainly learn/remember something useful looking through them.

Biome v2: The First Type-Aware Linter That Doesn’t Require tsc — Boasts being the first JavaScript and TypeScript linter that doesn’t require the TypeScript compiler, while still offering type-aware linting rules. There’s a lot to enjoy here, including initial support for linter plugins and improved monorepo support, though note that Vue and Svelte templates aren’t yet supported.

Emanuele Stoppa

IN BRIEF:

RELEASES:

Bun v1.2.16 – The high performance JS runtime adds support for returning files for routes via Bun.serve, along with a slew of bugfixes and Node compatibility improvements.
Astro 5.10 – The content-driven JS framework makes its responsive images feature stable, and adds a new experimental feature: live content collections.
ESLint v9.29.0 – Now supports the syntax used for explicit resource management (using and await using).
Hono 4.8, Relay v20, Fastify 5.4, NeutralinoJS 6.1, Axios 1.10.0

📖 Articles and Videos

▶ Compiling JavaScript Ahead-of-Time — The creator of the Porffor JavaScript compiler talks about the various ways to make JavaScript faster to execute, before digging into Porffor’s approach.

Oliver Medhurst

React Native 0.80 Released — React Native 0.80 lands with React 19.1, a new opt-in set of stricter TypeScript types, and experimental support for prebuilt dependencies on iOS to speed up builds. The legacy architecture is now officially ‘frozen’, with warnings for APIs slated for future removal.

Cohen, Cucci, Dall’Agnol, and Falch

Meticulous automatically creates and maintains an E2E UI test suite with zero developer effort. Relied on by Dropbox, Wiz, Lattice, Bilt Rewards, etc.

🚀 Build VueJS forms your way with Enforma — UI-agnostic (PrimeVue, Vuetify, Quasar), schema-ready, repeatable fields, powerful validation.

🎤 First speakers at JSNation US: Addy Osmani, Scott Tolinski, Ryan Carniato & more! Nov 17 & 20 in NYC & online. Early Bird going fast!

Here’s a selection of things from the broader ecosystem this week: