fidzu : javascript

#​791 - June 23, 2026

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JavaScript Weekly

Desktop Apps With deno desktop - Deno 2.9 (or the 'canary' build now) can turn JavaScript projects into self-contained apps on macOS, Windows, and Linux. Unlike Electron, you can opt to use the default OS WebView or a bundled Chromium backend, plus you get cross-compilation and automatic support for apps built on frameworks like Next.js and SvelteKit.

The Deno Project

📉 It's not in the post, but a --compress option gets packaged app sizes down a lot - from 65MB to 19MB in my test with a basic app.

Catch Runtime Bugs Before Your JS PR Merges - Some JavaScript bugs only show up after the app runs. Greptile reviews each PR with full repo context, runs the code in a sandbox, and returns screenshots, logs, and traces as proof of what broke. Use Greptile in GitHub, GitLab, or from your terminal.

Greptile sponsor

Babel 8.0 Released: The JavaScript Transpiler - It's been eight years since Babel 7.0, and despite the rise of tools like SWC and Oxc, weekly downloads of the @babel packages have increased 380x since. v8.0 is a modernization release that goes ESM-only and targets ~ES2023 by default (vs ES5 before).

Babel Team

TypeScript 7.0 Release Candidate - A step closer for the Go-powered TypeScript compiler that promises ~10x faster build performance. (I've seen people on social media getting very excited by this.)

Daniel Rosenwasser (Microsoft)

IN BRIEF:

• Cloudflare has added the ability to create and deploy Workers on 'temporary accounts'. Ostensibly 'for AI agents', but you can use them yourself too, and get a Worker running for 60 minutes with no strings attached.

• TC39 delegate Luca Casonato has made a proposal to add built-in localized time formatting to <time>, akin to GitHub's <relative-time> element.

• 🤖 MDN has introduced an official MCP server to provide better access to MDN's up-to-date JS and frontend docs to coding agents.

• The Bun team has proposed adding shared-memory threads to JavaScriptCore (a more traditional threading approach versus worker threads).

RELEASES:

• ⭐ Vite 8.1 - Adds experimental support for 'bundled dev mode' which radically speeds up dev server startup and full reloads on large apps. Also adds WASM/ESM integration support.

• ⭐ Astro 7.0 - The popular web framework gets faster build times, with .astro compilation and Markdown/MDX processing going through a Rust-powered pipeline. Advanced Routing also gives you full control over the request pipeline.

• pnpm 11.7 and 11.8 - pnpm install gets a --dry-run option, --frozen-store adds support for read-only package stores, and more.

• Node.js v26.3.1 (Current), v24.17.0 (LTS), and v22.23.0 (LTS)

📖 Articles and Videos

How an Underrated Refactor Saved 90% Memory Usage - The tale of how TanStack Table v9 uses less memory than v8 on large tables, thanks to a simple idea: storing methods on shared prototypes instead of creating them for every object. Benchmarks included, plus a pattern other libraries can copy.

Kevin Van Cott (TanStack)

You Already Know Enough JavaScript to Ship a Real Mobile App - Build for iOS and Android from one codebase with React. Expo handles builds, the App Store, and updates.

Expo sponsor

📄 window.showDirectoryPicker Opens Up a Whole New World - Chrome 86+ added a way to let users open a local directory for use by webapps. Steve Harrison

📄 What are Git Worktrees, And Why Should I Use Them? - A decade-old git feature that's seen a boost in the AI agent era. Cassidy Williams (GitHub)

📄 TanStack Start: A Mental Model for Next.js Devs - Maps TanStack Start onto Next.js concepts with side-by-side code comparisons. Adarsha Acharya

🛠 Code & Tools

FullCalendar 7.0: A Full Sized JavaScript Calendar - A Google Calendar-style experience for your own apps. Works with React, Vue and Angular (v7.0 adds Angular 22 support), but can be used with plain JavaScript. Here's a demo where you can play with the themes and styling approaches. MIT licensed with commercial extensions.

FullCalendar LLC

🤖 Eve: Like Next.js, But for Building Agents - A new framework from Vercel that provides Next.js-esque structure for building AI-powered agents using TypeScript and Markdown.

Vercel

Your Charts Endpoint Doesn't Need a Second Database - It's the query behind it, not the render. TimescaleDB extends Postgres for analytics. Get $1000 credit to start.

Tiger Data (creators of TimescaleDB) sponsor

ForesightJS 4: Predictive User Intent Library for the Web - Predicts intent from pointer and keyboard cues to prefetch content before it's needed for a snappier user experience. v4.0 adds official React and Vue packages with a declarative <Foresight> component in v4.2.

ForesightJS, Inc.

Prop For That: What JS Knows, Now CSS Knows - Provides CSS with access to values you'd often need JS to provide (e.g. pointer position, time, a slider's value). Add attributes to HTML and live values show up as custom properties, bridging the JS-CSS gap. The demo page is neat.

Adam Argyle

Kage: Shadow a Website for Offline Viewing - A tool to clone a site and serve it up for offline viewing. The difference vs "Save As" is it handles JS-rendered sites by saving the DOM using a headless browser. Repo.

Duc-Tam Nguyen

goja: An ECMAScript/JavaScript Engine in Pure Go - A mature JavaScript engine for adding scripting functionality to Go apps without CGo/V8.

Dmitry Panov

• Anime.js 4.5 - The powerful animation engine adds adapters to support animating non-DOM objects like Three.js meshes or a canvas context.

• Ink 7.1 - The popular TUI renderer adds suspendTerminal() for temporarily handing the terminal over to a child process (like an editor).

• Nuxt UI 4.9 - The Vue UI library improves its calendar component, adds uniform focus styles, and adds useTour for driving guided tours.

• Nx 23.0 - The monorepo tool's yearly major. Now nx migrate can hand migrations off to AI agents.

• ☀️ SunCalc 2.0 - Calculate the position and phase of the Sun and Moon.

📢 Elsewhere in the ecosystem

• A developer code-golfed a signal implementation to just 33 bytes (above). I had to stare at it for a solid minute before it clicked, but mercifully, a Redditor breaks down exactly what's going on.

• 🔒 GitHub has released actions/checkout v7 that "refuses common pwn request patterns by default" including refusing to fetch fork pull request code in pull_request_target and workflow_run workflows.

• If you're a GitHub project maintainer getting flooded with PRs, GitHub now has the ability to limit the number of PRs any single user can open at once.

• Tim Wehrle stored a website in a favicon. Why? Why not?

#​790 - June 16, 2026

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JavaScript Weekly

Flow for TypeScript Users in 2026 - Flow is Meta's mature typed dialect of JavaScript, and over the years its syntax has converged closely with TypeScript's. This post walks through where the two now differ: Flow's stricter defaults reject several crash-prone patterns TypeScript's strict mode accepts, and it adds features of its own, like exhaustive match expressions.

George Zahariev (Meta)

Free Claude Code Course from Anthropic + Master.Dev - Coding is changing fast, and the engineers who thrive will be the ones who direct AI instead of guessing at it. Lydia Hallie from Anthropic teaches exactly that in our Claude Code course, now free for everyone.

Master.dev sponsor

npm v12 to Stop Running Install Scripts by Default - The forthcoming npm v12 will no longer execute preinstall/install/postinstall scripts, unless you explicitly allow them. You can get ready now by using npm 11.16.0 which prints warnings about anything v12 would block.

GitHub

🤖 Code is Cheap(er) - The creator of htmx says that while code is increasingly easy to produce, understanding is still expensive, and "complexity remains our apex predator."

Carson Gross

IN BRIEF:

• The pnpm team has created a new GitHub Action to set up both pnpm and a JS runtime (Node, Deno, or Bun).

• 🐈 Compilecat (repo) is a new, experimental JavaScript performance compiler that does Closure-style optimizations.

• Several major projects are taking shape in beta/pre-release stages right now, including SvelteKit 3.0, Vue 3.6, Vite 8.1, and Astro 7.0.

RELEASES:

• Playwright 1.61 - You can now register and test passkeys, as well as read/write to localStorage and sessionStorage via a new WebStorage API.

• ESLint v10.5.0 - Five core rules now highlight smaller ranges of code to avoid shadowing other problems in editors.

• 🤖 TanStack AI Beta - Framework and provider-agnostic AI toolkit.

📖 Articles and Videos

How TanStack Cut TypeScript Type-Checking Work by Up to 86% - TanStack Table v9 (now in beta) made its features modular, but the generic types behind that flexibility introduced noticeable editor lag in alpha. This deep-dive shows how the team used tsc diagnostics to cut type-checking work by 62-86%, with lessons for anyone authoring type-heavy libraries.

Kevin Van Cott (TanStack)

🛠️ React Libraries and Tools for 2026 - Every year, Robin updates this post covering his opinionated list of essential React ecosystem libraries.

Robin Wieruch

Your AI Writes Tests That Pass but Prove Nothing. Fix It - Wallaby CLI makes test generation 10x smarter with live coverage and runtime data, using 3x fewer tokens. One skill to install.

Wallaby Team sponsor

Changing the Kindle's Homepage by Editing Hermes Bytecode - The Kindle's UI now runs on a Hermes-powered JavaScript stack. Here's how you can edit the bytecode Hermes produces to change the Kindle UI's behavior.

Nicholas Tarta

📈 Making numpy-ts as Fast as Native - How a TypeScript NumPy port went from 15x slower to matching native, by changing not whether to use WASM, but who owns the bytes.

Nico Dupont

📄 How Building an HTML-First Site Doubled Our Users Overnight - Out with the React, and in with the Astro. Alistair Davidson

📄 Building a Real Blog Easily in Astro - By real, Zell means something beyond demo-level, with excerpts, post update dates, etc. Zell Liew

📄 Streaming HTML with textStream() in Chrome Canary Ollie Williams

🛠 Code & Tools

eslint-plugin-unicorn 67.0: More Than 200 Powerful ESLint Rules - Sindre's set of curated rules has grown a lot, with almost 100 added or updated in the past few weeks alone. Like enforcing better comments, limiting the depth of nested calls, preferring Temporal over Date, and preferring HTTPS over HTTP in URLs. These rules will seriously challenge (and improve!) your code.

Sindre Sorhus et al.

zod-compiler: Compile Zod Schemas into Zero-Overhead Validators - A build-time compiler that plugs into Vite, webpack, et al. and rewrites existing schemas into optimized, tree-shakeable validators. Claims 2-75x faster validation with no source changes and the full Zod API preserved.

Gajus Kuizinas

That Slow Analytics Endpoint? It's a Database Problem - Pipelines, sync lag, stale data. That's the cost of a split stack. TimescaleDB extends Postgres so your app stays fast.

Tiger Data (creators of TimescaleDB) sponsor

📊 billboard.js 4.0: A JavaScript Chart Library Based on D3 - At almost nine years old, billboard.js now has a new, opt-in canvas-based rendering mode (SVG remains the default), smaller bundles, and better performance on large datasets. There are hundreds of demos ranging from donut charts and funnel charts to overlapping bar charts and radar charts.

Jae Sung Park (NAVER)

PolyCSS: CSS 3D Engine for the DOM - Renders textured 3D polygon meshes entirely in the DOM using CSS matrix3d() transforms - no WebGL or <canvas> required. Works with vanilla JS, React, and Vue. There's a gallery to explore and a live builder if you want to play around.

LayoutitStudio

• Tabulator 6.5 (above) - Create interactive tables from any HTML table, JS array or JSON data.

• 🕒 <relative-time> 5.2.0 - Web Component for formatting automatically-updating timestamps as localized strings or relative times.

• Fable 5.2 - No, not the LLM you can't use, but an F# to JS/TS (and now Erlang too) compiler you can use. More info.

• React Native 0.86 - Edge-to-edge support on Android 15+ and improvements to its DevTools.

• Biome 2.5 - The fast code formatting and linting toolchain has now passed 500 lint rules.

• get-value 4.1 - Use paths like a.b.c to get a nested value from an object.

• axios v1.18.0 - Promise-based HTTP client for the browser and Node.

• 📊 visx 4.0 - Airbnb's visualization primitives for React.

📢 Elsewhere in the ecosystem

• 🌐 The WebKit team shows off MapKit JS 6 (above), a way to integrate Apple Maps into your site like in this example. You need a token from an Apple Developer account though.

• 😱 A developer was sent a malicious JavaScript 'coding test' by a fake recruiter on LinkedIn in an attempt to backdoor his machine. I've heard about this vector a few times this year, so be careful.

• WASI 0.3 (WebAssembly System Interface) has launched, bringing native async support to WebAssembly Components.

• performative-ui is a fun set of modern clichéd "AI startup" UI components for React, like ASCII hero art and node graph backgrounds.

• A dev had an old USB scanner with no modern drivers, but got it working via a browser-based WASM-powered emulator bridged to the physical scanner through WebUSB. He previously did something similar with an old printer.

#​789 - June 9, 2026

Read on the Web

JavaScript Weekly

VoidZero is Joining Cloudflare - One of the year's big moves in JS tooling, as told by Evan himself. The company he founded to build Vite, Vitest, Rolldown, Oxc, etc. is joining Cloudflare. He's candid about why (monetization is hard). Good news: all projects stay MIT-licensed, and Evan and co remain in charge.

Evan You

💰 In the Vite team's post, they reveal Cloudflare is starting a $1 million fund to support Vite ecosystem maintainers and contributors.

Come for Great PostgreSQL Talks - Virtual and Free - Attend talks about PostgreSQL-backed app development at POSETTE: An Event for Postgres 2026 (16-18 June). Join live and chat directly with PostgreSQL speakers, other developers and users. There is also swag waiting for you. Register for updates.

Microsoft | AMD sponsor

Announcing Angular v22 - Google's batteries-included framework graduates three big features to stable/production-ready: Signal Forms, Angular Aria, and asynchronous reactivity. The router also adds experimental support for the native browser Navigation API.

The Angular Team

IN BRIEF:

• Safari 27 (beta), announced at WWDC, includes a standards-compliant ESM loader rewrite improving top-level await support, and adds support for JSPI (JavaScript Promise Integration) in WebAssembly.

• Electron 43 is in beta with big perf boosts, thanks to an embedded Node.js snapshot, bundles cached as V8 bytecode, and link-time optimization on the main binary.

• The Rust port of React Compiler is ready to test (Meta is already seeing "great results") - it's set to be merged imminently.

RELEASES:

• TanStack Table v9 Beta - A powerful headless engine for creating data grids with support for React, Preact, Solid, Vue, Angular, Svelte, and Lit.

• Node-RED 5.0 - 'Low-code' flow programming environment, built on Node.js.

• Rolldown 1.1, pnpm 11.5, RunJS 4, Emscripten 6.0

📖 Articles and Videos

Modern Engineering Values - "I cannot believe that I used to write code by hand!" The creator of Jest and Fate says that as agents write more software, the engineering values that matter shift, with ownership, taste, and strict-but-fast feedback loops at the fore.

Christoph Nakazawa

'I Wish Deno Would Keep Doing What It Does Best' - A Deno fan argues that chasing Node.js/npm compatibility is costing the runtime its edge as a zero-config, web-standards, all-in-one-binary experience.

Hong Minhee

How Is Your App Performing in Production? - Ship a release this morning. By tonight you can know if the app got faster, slower, or worse for any specific cohort of users.

Expo sponsor

What Bun Can Tell Us About AI and Open Source - An analyst looks at Bun, whose code is increasingly AI-produced rather than human-written, as a bellwether for whether AI-authored core infrastructure is sustainable.

Stephen O'Grady (RedMonk)

📺 All 17 TanStack Projects in One App - TanStack is now a huge suite of libraries, and if anyone can pull them all into one app, Jack can! Jack Herrington

📄 Everything You Need to Know About Source Maps Neciu Dan

📄 How TypeScript Infers Type Variables Nicolas Laurent

🛠 Code & Tools

Geometric.js: A Library for Doing Geometry - Created by someone who works on graphics for the NYT, this elegant library lets you work with polygons, bounding boxes, reflection, interpolation, rotation, and the like (examples). Does one polygon intersect with another? There's a function for that.

Harry Stevens (The New York Times)

Ship Real-Time Features Without a Second Database - TimescaleDB extends Postgres for live analytics on event data. No pipeline, no extra infrastructure. $1000 credit.

Tiger Data (creators of TimescaleDB) sponsor

Micromodal.js: A Tiny Library for Accessible Modal Dialogs - No-dependency library for WAI-ARIA guideline-compliant modal dialogs. Offers extra polish versus <dialog>, with hooks, scroll-locking, in/out transitions, and click backdrop to dismiss.

Ghosh and Singh

📝 PDFSlick 4.0: View and Interact with PDFs in JS Apps - A PDF viewer for React, Solid, Svelte & vanilla JS apps that goes from simple PDF viewing up to working with multiple, large documents with annotations. Demo.

Vancho Stojkov

babel-plugin-zod-hoist: Hoist Zod Schema Definitions to the Top of the File - From the creator of Slonik comes a way to make Zod validation significantly faster.

Gajus Kuizinas

• eslint-plugin-functional 10.0 - Linter rules to disallow mutation and encourage functional programming.

• ts-loader 9.6 - The TypeScript loader for webpack adds webpack 4 support back again.

• 🧊 Draco.js - A pure JS Draco mesh loader for three.js by mrdoob himself. (Demo.)

• Taiga UI 5.10 - Popular suite of 50+ components for Angular.

📢 Elsewhere in the ecosystem

• Oxide Computer Company's Mitos ASCII Tool (above) converts images into ASCII text illustrations and animations, by way of a built-in livecoding environment (built upon the fantastic play.core).

• 🔁 replacements.fyi, from the e18e team, is a handy way to find replacements for npm packages of your choice, whether that's a simpler package, a code snippet that does the same thing, or a native API.

• ⚡ Add Obs.js to a page and it adds classes to <html> to customize the UX based on how much performance is available (e.g. bandwidth, CPU, latency). Harry Roberts explains further.

• 🕹️ Raymond Camden set out to see if Chrome's built-in AI could play Zork 1, the classic text adventure game.