fidzu : javascript

#​806 - October 13, 2026

Read on the Web

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.

#​804 - September 29, 2026

Read on the Web

JavaScript Weekly

How Anthropic Made Claude's Apps 3x Faster in Two Weeks - A grab bag of performance lessons from a sprint that cut p75 'time-to-typeable' from 3.1s to 0.55s. Em dashes (the irony!) pushed V8 onto a slower regex path, a stray location.reload() caused half a million hidden reloads a day, and more.

Wang, Attard, and G (Anthropic)

Still Writing Tests? Meticulous Is Here - Notion, Dropbox and Wiz are now using a testing paradigm they can't ship without. Built by former Palantir engineers, Meticulous creates an evolving suite of deterministic E2E UI tests, delivering exhaustive coverage with zero developer effort.

Meticulous AI sponsor

Vite+ 1.0: One CLI for Your Entire JavaScript Toolchain - The single vp command can now manage your Node runtime (if you wish), package manager, dev server, linting, formatting, testing, builds and task running, configured from vite.config.ts. vp migrate can be used to bring existing Vite, Vitest, ESLint, tsup, and similar setups into Vite+.

VoidZero

💡 Evan You also looks back at four months of VoidZero at Cloudflare, including work on the Oxc React Compiler, Vitest 5, stable type-aware linting, and more.

IN BRIEF:

• The latest TC39 meeting is taking place in Tokyo now, and three iterator proposals have already advanced to stage 4: chunking, join and includes (the latter just shipped in Chrome 154).

• Jarred Sumner shared 𝕏 a preview of Bun compiling JavaScript ahead of time: 24% faster startup and 48% less memory for Claude Code, but ~2x binary size.

• 🎉 Cloudflare finally has a single CLI for all of its APIs. cf is written in TypeScript and covers everything, whereas Wrangler only ever covered a subset.

• The Angular team is building a partly Rust-powered compiler, because TypeScript 7's Go port lacks APIs the current one relies on.

RELEASES:

• MSW (Mock Service Worker) 3.0 - The popular API mocking library is now ESM-only, adds a Vite plugin, supports GraphQL subscriptions, and can intercept page navigations and form submissions.

• Vinext 1.0 - Cloudflare's Vite-based Next.js reimplementation now supports the Pages and App Routers, and offers a migration path for existing apps.

• Mermaid 12.0 - The diagramming tool now defaults to the ELK layout engine for flowchart, class, state and similar diagrams, so existing ones will look different unless you set layout: dagre. Also adds UML use case diagrams.

• pnpm 12.8, Angular 22.2, TinyBase 10, QUnit 3.0

📖 Articles and Videos

The Grand Unifying Architecture of Frontend - SolidJS's creator argues that HTMX, React, LiveView, and friends differ mostly in how they split the same three jobs (navigation, content, and instant UI feedback) between client and server. He then shows how Solid 2.0 aims to cover the whole spectrum.

Ryan Carniato

Build Products That Help People Build Their Lives - Fidelity technologists can change the way our clients invest - for the better and for everyone.

Fidelity Careers sponsor

Optimizing Objects with null Prototypes - In V8, objects created with { __proto__: null } or Object.create(null) start in a slower 'dictionary mode'. Matteo shows how creating a plain object and then setting its prototype to null preserves fast properties.

Matteo Collina

💡 If you fancy going deeper, Fast properties in V8 is the V8 team's 2017 explainer of how objects switch between fast and 'dictionary' mode.

Node.js Built-ins That Replace npm Packages - A tour of 12 Node built-ins that replace common ecosystem packages along with their stability levels and some gotchas that might keep you using the established alternatives.

Flavio Copes

📄 JavaScript's Greatest Pun? ${{ }} - Looks like Mustache, but ${{ name }} passes an object using shorthand properties to a tag function, preserving both the variable's name and value. Nishant Shukla

📄 How GitHub Improved Performance by Moving Off CSS-in-JS Josh Black and Marie Lucca (GitHub)

🛠 Code & Tools

Size Limit: A JavaScript Performance Budgeting Tool - Set a size or load-time budget for your code and this tool can fail CI (or flag a PR) if a change goes over it. You can also do one-off checks and see visualizations of where the bytes are. Framework-agnostic and doesn't care which bundler or CI you use.

Andrey Sitnik

Your UI Gets Blamed for a Slow Query - TimescaleDB extends Postgres so the query behind your UI returns fast as data grows. Get $1000 credit to start.

Tiger Data (creators of TimescaleDB) sponsor

EmDash 1.0: Cloudflare's WordPress 'Successor' is Now Stable - An Astro-based alternative to WordPress, now with a decentralized AT Protocol-based plugin registry and plugins that run in sandboxes. It's not Cloudflare-only, either, as it also runs on Node.js.

Buscemi, Kane, and Pham (Cloudflare)

📝 DOCX 9.8: Generate Word .docx Files from JavaScript - A comprehensive library for generating docx files. It's only a few months since we linked to it, but this is a big release with support for charts, shapes and watermarks, plus more math notation support. (Homepage.)

Dolan Miu

• 🔊 wavesurfer 8.0 - Popular audio waveform renderer and player. Refactored for better efficiency, with numerous bug fixes.

• pretty-bytes 7.2 - Convert byte quantities into human readable strings.

• ✉️ postal-mime 4.0 - An email parsing library that works everywhere.

• Typia 15.0 - Turn pure TypeScript types into runtime validators.

📢 Elsewhere in the ecosystem

• 🎵 Tonny Espeset has recreated the '80s hit Take on Me by A-ha in pure JavaScript (along with synthesized vocals!), running through the always-entertaining Dittytoy online JavaScript music playground.

• Git 2.56 has just been released. It adds git add --resolved to safely stage merge conflict fixes, git branch --delete-merged for bulk branch cleanup, and more. All explained within.

• TanStack's Tanner Linsley built Redact, 'an alternative logical projection of React' aiming for full API compatibility with a simpler implementation, smaller bundles and better performance. It's now on GitHub.

• A quick history of why certain port numbers like 3000 and 8080 are commonly used in development.