fidzu : javascript

#​807 - October 20, 2026

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JavaScript Weekly

tsrs: Cloudflare and VoidZero's Rust Port of TypeScript - A Rust port of the Go-based TypeScript 7 compiler, built with some input from the TypeScript team and heading into Oxc. Benchmarks claim up to 8x the speed of TypeScript 7.0 and it runs in WebAssembly. Experimental, but npx tsrs works.

Chen, Mitropoulos and Nakazawa (Cloudflare / VoidZero)

💡 Max Schwenk started the port with agents writing the code, and tells the full tale here, including how it took his company's typecheck from 80 seconds to 7.

Send Webhooks from Your TypeScript API in Minutes - One typed npm package, one call per event. Svix handles retries, signing, delivery logs, and a portal for your customers, so you don't build any of it. Resend sends 200M+ webhooks a year through it.

Svix sponsor

Thank You, Deno: Competition Keeps JavaScript Moving - Last week we covered Deno joining Cloudflare and the future of the Deno runtime. Deno was valuable, says Darcy, as it (and Bun) made the entire ecosystem better by pushing Node and npm to adopt its best ideas.

Darcy Clarke (vlt)

IN BRIEF:

• 🔒 Next.js has patched two critical RCE flaws: one in use cache functions via an upstream React Server Components bug and one in the image optimizer's SVG handling. Upgrade to 16.4.1 or 15.5.28; a public PoC is already out.

• 🔒 Node.js security releases are due tomorrow for the 26.x, 24.x and 22.x lines, with the highest severity issue rated high.

• Bun compiling JavaScript ahead-of-time, previewed a few weeks ago, now has a draft PR to produce binaries with no JIT or bytecode.

RELEASES:

• Node.js v26.12.0 (Current) and v24.22.0 (LTS) - 26.12 can now synchronously load most ES modules and marks the config file stable; 24.22 gains util.throttle and util.debounce.

• Astro 7.4 - Adds a --timings flag for astro build to see where build time is spent, plus experimental parallel prerendering across worker threads.

• React Router 8.5 - Deprecates its own view transition APIs in favor of React's <ViewTransition> component, and adds an experimental 'API-only' mode.

• Pretext 1.0 - Multiline text layout without touching the DOM. 1.0 ports browsers' own line breakers, so results more closely match what would render.

• React Native 0.88, Elysia 2.0 RC, ESLint 10.13, tsup 9.0, Vuetify 4.3

📖 Articles and Videos

The Tetris Script That Becomes Snake Once Prettified? - You'd think pretty-printers and deobfuscators at least leave a script's logic alone, but no. See how chaining semantic quirks in such tools can turn the 'cleaned up' output into a different program!

Robert Vähhi (TrustSig)

Do Web Components Have a Future If Nobody is Writing Them? - Nolan has spent years building and defending web components, so this thoughtful, if a little melancholy, piece carries some weight.

Nolan Lawson

Your CI Was Built for Humans. Your Agents Need Something Else - Expo is mobile AI infrastructure. Your agents build, test and ship iOS and Android apps in the background.

Expo sponsor

▶ ViteConf 2026: The Full Replay - Last week's ViteConf brought ~30 talks including Evan You's keynote on tooling in the agentic era, plus updates on Vitest 5, Vite DevTools, and a faster parser coming to Oxc. It's 10 hours, but there's a hero with timestamps in the comments.

ViteConf

💡 One of the bigger announcements: Void, the Vite team's full-stack SDK and deploy platform, is now open source.

How to Gaslight JavaScript Programmers (with Proxies) - Proxy, introduced as part of ES6 back in the day, has plenty of practical uses but can also make objects behave in curious, unexpected ways. Complete with live, editable examples.

Bryan Gillespie

How Miro Moved 70,000 Tests from Jest to Vitest - The story of moving ~70,000 tests across an 800-package monorepo to Vitest, with AI agents doing most of the laborious work.

Sergey Nikitin

📄 Upgrading to Zod 4 Cut Our Worker CPU by a Third - A Zod 3 to 4.5 migration at 100 million parses a day. Chris Arderne

📄 Using replace() as an Iterator - An old regex-callback-for-side-effects idiom, benchmarked against alternatives. Eugene Lazutkin

📄 Recursion is DEAD and HTML Killed It - Hands-on with Chromium's experimental Declarative Partial Updates proposal. Dave Rupert

📺 NightMonkey: Compiling JavaScript Ahead of Time to WebAssembly - An hour-long VMIL 2026 talk from a Wasmtime engineer. Chris Fallin

🛠 Code & Tools

Maplair: A Batteries-Included, Tree-Shakeable Fork of Leaflet - Still in alpha since last year, one of Leaflet's contributors has forked it, rolling in the 2.0 work plus rotation, fullscreen, search, heatmaps and more - all tree-shakeable.

Simon Legner

💡 The same day, Leaflet's creator posted a candid update about his experiences living in Ukraine and a plan to get Leaflet 2.0 released.

Embeddable DOCX, XLSX & PPTX Editor for Users and AI - Let your AI edit existing files via object-level APIs. Users review and keep editing the same file. Try Playground.

Thinkfree sponsor

📊 Chartist 2.0: The Lightweight SVG Charting Library Returns - A CSS-styled SVG charting library from 2014 that "went stale over the last years" makes a comeback with a composable API, server-side rendering to SVG, terminal charts, and still ~12KB gzipped for a line chart. There's a migration guide for 1.x users.

Gion Kunz et al.

Pele: Mermaid Diagrams as Lightweight, Themeable SVG - Zero-dependency renderer for the Mermaid diagram syntax with responsive layouts and SVG you can theme with CSS variables. Around a sixth the size of Mermaid.js. Try the playground.

Steph Ango (Obsidian)

<rich-input>: A Rich Input Field with GitHub-Style Search Filters - A web component for GitHub-style search boxes: free text mixed with autocompleted key:value filters, highlighted in place.

Bramus Van Damme

• Chokidar 6.0 - The file watcher behind much of JS tooling. Rewritten to check changes against the disk before reporting to avoid stray events after a burst of edits, say.

• Happy DOM 21.0 - Headless browser environment in pure JavaScript, popular for testing. Now blocks stylesheet and iframe loading by default.

• p-queue 10.0 - Promise queue with concurrency control. Now dependency-free and an EventTarget.

• Paper.js 0.13 and 0.14 - Vector graphics scripting framework for canvas. First notable releases in years. (Homepage with demos.)

• 🕹️ LittleJS 1.27 - Dependency-free HTML5 game engine that now does 3D too.

• 🖼️ Skia Canvas 4.0 - Canvas API for Node, built on Skia.

📢 Elsewhere in the ecosystem

• 🖼️ JPEG XL: The modern image format is now supported by all major browsers, with Firefox 158 the latest to enable it by default. Jake Archibald pits it against AVIF in this extensive review. What I find amazing is what it's able to render in under 100 bytes.

• NodeConf EU 2026: The ▶️ latest NodeConf EU talks are up, including James Snell's case for a common minimum API every runtime should support, plus sessions on V8 heap management and Emscripten and WebAssembly.

• A new social network: /dev/null is a GitHub-oriented social network for developers, built from scratch in 48 hours. It already has over 8000 members, including me. It's been a lot of fun so far!

#​806 - October 13, 2026

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JavaScript Weekly

Deno is Joining Cloudflare (But…) - Maybe David Bushell saw the writing on the wall, as the Deno team isn't joining Cloudflare to keep working on Deno, but to fold celld into workerd so Durable Objects can be self-hosted (more on that here). The Deno runtime will get a final year of official fixes, Deno Deploy closes in six months, and JSR moves to Cloudflare's infrastructure.

Ryan Dahl

💡 On Hacker News, Ryan Dahl noted that Deno "has been sucked into the gravity well of Node compatibility" before asking: "Why reimplement Node? It works." But what happens to the JavaScript™ trademark case, I wonder…?

CodeAF: #1 of Ten Coding Harnesses on DeepSWE - Ten coding harnesses ran the same open model on 113 real GitHub issues. CodeAF solved the most and paid the least per solved issue: 3.4x less than Claude Code, 4.8x less than OpenCode. A new open-source coding harness built for open models.

AgentField AI sponsor

Bun 1.4.3 Adds bun check, a Built-In TypeScript Type Checker - bun check is a port of TypeScript 7's checker that reads your tsconfig.json, reports the same errors as tsc and, Jarred claims, runs 3-6x faster. It plugs into bun run/test/build too. Idle server processes now use far less CPU, and a JavaScriptCore upgrade picks up numerous perf gains.

Jarred Sumner

IN BRIEF:

• AWS has launched Lambda Web Functions, which run an ordinary port-listening Node server (Express, Hono, Fastify, etc.) on Lambda with no handler rewrite, billing for active CPU time and separately for memory.

• 📊 The 2026 Stack Overflow Developer Survey results are out (30,903 people took part) with JavaScript the #1 language for the 12th year in a row (and TypeScript at #6).

• 🔒 Despite this week's fresh stir, no malicious Zod release reached npm. Malicious commits pushed to its repo in September were reverted the same day, as Colin McDonnell explains.

• 🔒 An out-of-band Next.js security release is due tomorrow.

RELEASES:

• Last second addition: TanStack Start 1.0 has just dropped. Big news for full-stack React and Solid fans! :-)

• 🎉 Partytown 1.0 - A popular way to relocate third-party scripts to run in a Web Worker rather than on the main thread has left beta after five years in development.

• Marionette 5.0 - Six years on, the Backbone-era framework returns with a core free of Backbone, jQuery and Underscore… and they explain why!

• Bootstrap 6 Alpha - An early look at Bootstrap's first major release since 2021, leaning on modern CSS and making its JavaScript plugins ESM-only.

• Express 5.3.0 - A maintenance release worth upgrading to, as patched qs, proxy-addr and body-parser dependencies close five CVEs.

📖 Articles and Videos

📊 WebSocket Servers in JavaScript: Node.js, Bun, and Deno - In 2023, Daniel found Bun much faster than Node at relaying WebSocket messages, but there was a bug in his Bun server. This new attempt uses a C client/relay as a baseline, and Node 26 now gets close to C latency, ahead of Bun and Deno.

Daniel Lemire

How Sindre Sorhus' Personal Site is Now Made in Swift - One of JavaScript's most prolific developers explains how he's dropped Astro and now builds his personal site with Swift, including the styling and markup, with broken links and style typos failing at compile time (source).

Sindre Sorhus

Too Many Agent Traces to Read? Find the Ones That Matter, Live Oct 14 - Bad answers, wrong tool calls, too many traces. See how Sentry engineers find the failures worth fixing. Register now.

Sentry sponsor

Tiny Apps with TinyJS - A quick look at a new way to make tiny JS-powered desktop apps we featured a few weeks ago.

Raymond Camden

📄 Yet Another Way to Invoke Functions Without Parentheses - There are many ways to invoke arbitrary functions in JavaScript without using parens, but this is a particularly obscure one! bartosz

📄 Six Months of Building with Remix 3 - What the post-React Remix (v3 was released earlier this month) is like to work with day to day. Sergio Xalambrí

📄 A Visual Notation for React's Parent and Owner Trees - With a playground that draws them from your code. Jules Blom

📄 How to Test an iframe's postMessage Handler Keshav Malik

🛠 Code & Tools

🤖 OpenCode 2.0: A Big Update for the Open Coding Agent - A full-featured agentic coding app, built on Bun, that's more akin to Claude Code than Pi, say. v2.0 overhauls it with background subagents, a 'code mode' to let models script MCP tool calls, and clients for vanilla JS and Effect code to drive it.

Anomaly / The OpenCode Team

💡 If you've not given OpenCode a try yet, you can get started here.

Tamagui 3: One React UI Codebase for Web and Native - A styling system and component kit for sharing UI between React web apps and React Native, with a compiler that keeps things fast on both. v3 adds Tailwind-style props and React Strict DOM support.

Nate Wienert

Mobile AI Infrastructure for Web Devs Who Code with Agents - Point the agent you use for the web at iOS and Android. Expo takes care of the native builds and the trip to the stores.

Expo sponsor

H3 v2: The UnJS HTTP Framework Rebuilt on Web Standards - The minimal HTTP framework behind Nitro and Nuxt's server layer is now stable in v2, a rewrite around standard Request and Response so the same app runs on Node, Bun, Deno, Workers, and even in the browser. Migration guide.

Pooya Parsa

Shaders: 190+ WebGPU Effect Components, Now Open Source - Ripples, glows, and dissolves into ASCII, composed as components rather than written as shader code, for React, Vue, Svelte, Solid, or plain JS. The engine, framework bindings, and the components themselves are now all MIT licensed.

Simon Le Marchant

💡 If you like this vibe, ascii.rest, which offers "236 animated ASCII pieces for web pages", is also worth a look.

• Node.js v26.11.0 (Current) - Adds a --process-timeout flag to end a process after a set time, plus virtual table support in node:sqlite.

• Hono 5.0 RC - The web-standards server framework goes ESM-only and moves its runtime adapters into separate packages.

• 🔒 Handlebars 4.7.10 - The templating library fixes two critical JavaScript injection flaws affecting releases back to 3.0.

• he 2.0 - Robust HTML entity encoder/decoder. First release in eight years, now ESM with named exports.

• React Aria 1.22 - Adds a new Sheet component.

• pnpm 12.12

📢 Elsewhere in the ecosystem

• In Fingerprints are the New Cookies, Roy Fish demonstrates the various ways web pages can assign a unique(ish) identity to you using JavaScript.

• 🤖 Theo Browne set AI agents loose on porting the TypeScript 7 compiler to Rust, and ts-rust is the (very experimental) result.

• 📱 Following Shopify, Coinbase is moving its app off React Native, saying agents have made building each feature twice cheap enough to go fully native.

• Fancy a retro robot voice in your web experience? Klattsch is a voice synthesizer you can use on the web or from Node.js as an npm package. Daiiisy, daiiisy…

• Three years ago we mentioned Linus Groh's Zig-based Kiesel JavaScript engine. It passed 25% of test262 back then, but v0.4.0 has landed and it's now at 94.7% (not far behind V8) and supports modern language proposals like await dictionary and numerous iterator proposals.

#​805 - October 6, 2026

Read on the Web

JavaScript Weekly

Why Don't More Developers 'Use the Platform'? - A thoughtful look at why we often rebuild what browsers already offer, from someone usually on the platform's side. It kicked off an extensive Hacker News discussion, with many arguing native controls and APIs are too limited or awkward to depend on.

Nolan Lawson

Free Course: Build Ambitious Modern Interfaces Faster with OpenAI Codex - Join Katia Gil Guzman for this free Codex course and learn how agentic coding has changed frontend development. You'll cover setup, prompting, feedback, skills, automations, deployment and more.

Master.dev sponsor

Preact 11 Released - Six years after the road to Preact 11 began, the latest version of the popular "alternative to React with the same modern API" is here, with improved hydration, automatic ref forwarding, and an ESM-only package. The upgrade guide covers the changes.

The Preact Team

Nuxt 4.6: A Big Step Towards a Server-Agnostic Nuxt - A meaty release for the full-stack Vue framework with a server layer that no longer ties you to Nitro (pure Vite server builds are now an experimental option), built-in sessions, Vue Vapor support, and a new CLI (Nuxt CLI 4.0).

Daniel Roe

IN BRIEF:

• Prolific package maintainer Sindre Sorhus has disabled outside pull requests due to AI contribution spam, though he'll keep maintaining his projects. SWC also now restricts PRs to trusted contributors.

• 📊 The JavaScript Framework Benchmark site has added results for Chrome 154 covering 196(!) ways to implement an app, how each performs, and how large they are.

• npm stage publish can now create new packages, so automated workflows no longer need a manual first publish.

RELEASES:

• Remix 3.0 - No official post yet, but the new stable release of the rebuilt full-stack framework, with no React required. The RC release post has more info, though.

• Ink 8.0 - The popular TUI renderer now requires React 19.3 and adds scroll offsets for building scrollable views, now common in coding agent UIs.

• Inferno 10 - React-like UI library built for raw rendering speed. Now shifts more work from runtime to its JSX compiler.

• Qwik 2.0 RC, pnpm 12.10, Ember 7.3, Video.js 10, ESLint 10.12

📖 Articles and Videos

Getting Started with Claude Code Mods - Claude Code has just added support for Mods, a way to extend the agentic coding harness with JavaScript so you can watch events, change behavior, and draw custom UI. Addy builds a mod here in ~80 lines that shows a live 'forecast' of your context window.

Addy Osmani

Friendship Ended with Deno, Now Node is My Best Friend - David felt good about Deno in 2021, but has now returned to Node and is surprised by how much has improved. He ported his site generator back with barely any changes, and doesn't hold back on where he thinks Deno went wrong.

David Bushell

100+ Search Engines. One Simple API - Build with real-time data from Google, YouTube, Amazon, and more. SerpApi delivers structured JSON and Markdown for AI agents and your apps. Skip scraping headaches.

SerpApi sponsor

I Tested 11 HTTP Resilience Libraries - How do fetch wrappers like Ky, ofetch, and Wretch behave if you abort mid-retry? The author of ffetch tested eleven options and found five still attempt retries after cancellation.

Gabor Koos

📄 How Booking.com Cut Its Node.js Service's Costs by 38% - By moving from PM2 to Watt's worker threads and reworking load balancing and worker configuration. Ilya Malyavin

📄 Readable Regular Expressions for TypeScript, Inspired by Emacs - Rebuilding the SemVer regex from named, composable pieces. Rahul M. Juliato

📄 On Automatic Type Refinements - Which filter callbacks let TypeScript narrow an array's type, and which don't. Radosław Miernik

🛠 Code & Tools

TanStack Charts 1.0: A Composable, Typed Charting Library - A framework-neutral way to declaratively specify visualizations in typed, tree-shakable JavaScript which are then rendered with SVG or Canvas. The extensive sample catalog (with code) shows off line, bar, pie and area charts, plus heatmaps, box plots, histograms, etc.

Tanner Linsley

SvelteKit 3: 'The Same Framework with a Little More Polish' - Svelte's official app framework gets a cleanup/polish release. Few new features, and remote functions remain experimental, but existing users have some work to do to migrate (though sv migrate can handle much of it).

The Svelte Team

Publish to Miris Straight from Adobe Substance 3D Painter - Stop sharing decimated 3D content. Stream your high-fidelity Adobe Substance 3D Painter assets via the Miris plugin.

Miris sponsor

Effect 4.0: A Smaller Core, Rebuilt Runtime - A ground-up rewrite of the popular library for building reliable apps that handles tricky stuff like resource management, concurrency, retries, typed errors, and more. v4.0 boasts 5x smaller minimal bundles and 86% less memory used per concurrent task.

Sebastian Lorenz

Lightpanda 1.0: A Headless Browser for Automation - A headless browser built from scratch in Zig. With no graphical rendering, it uses a fraction of Chrome's CPU and memory (~35MB memory in a run I just did!). Drive it with Puppeteer/Playwright or, the fun bit, script it with plain JavaScript.

Francis Bouvier

• eslint-cssicorn 0.1 - Sindre Sorhus has moved the CSS-only rules from his mammoth eslint-plugin-unicorn ESLint ruleset into a new CSS-focused package.

• pixelmatch 8.0 - Tiny, fast pixel-level image comparison library. Switches to a more perceptually accurate color metric, so diff counts will change.

• PR Comment Inbox - Nicholas Zakas's email-style inbox for GitHub review comments, with threads and read/unread state.

• Electron Forge 8 - Toolkit for building, packaging, and publishing Electron apps.

• Redux Toolkit 2.13 - The official Redux toolset adds TypeScript 7 support.

📢 Elsewhere in the ecosystem

• 📊 The State of Devs 2026 survey results are out with over 5,000 developers sharing their thoughts on software development career security, AI use/sentiment, hobbies, and the workplace (including income).

• Why does example.com now load JavaScript? The IANA says since most clients hitting the site are automated and don't load JavaScript, it's a way to save bandwidth. There's more on the site's recent redesign here.

• Netlify explains how it reduced Edge Function invocation latency by ~5x, switching from hosted V8 isolates to Unikraft MicroVMs on its own edge network.

• 🤖 Pi 1.0, the minimal Node.js-based coding agent, adds MCP and non-LLM model support through 'Codemode'. They also launched an experimental Pi Durable runtime for running resilient, long-term agent flows.