🏖️ A brief scheduling note: We're taking a summer break next week, so we'll be back in your inbox on August 25. Catch you then! __ Your editor, Peter Cooper
JavaScript Weekly
Migrating a Large Flow Monorepo to TypeScript — Over several years, Yelp moved 1.4 million lines off Flow, and this writeup is more useful as a guide to running any long migration than as a Flow story. It was a big win on its own terms, with type coverage up from 83% to 96%.
Render Runs JavaScript, Front to Back — Link your repo and Render takes it from there. Wire up your Vite site to your Hono API to your BullMQ job to your distributed agent workflow, all on one platform. Loop in your agent with official Render /plugins for Codex and Claude Code. Start free and scale from there.
Render sponsor
Kitesurf: Cloudflare's Agent-First Browser in V8 Isolates — A browser engine that runs on Workers with one isolate per page. Aimed at agents rather than humans, it uses 3-7x less CPU and memory than Chromium, at the cost of being slower. You can try it out now in beta, and it'll be open sourced in due course.
Martinho, Constant, Figueira, and Duarte (Cloudflare)
How Baseline Can Help You Ship Less JavaScript — A practical audit method for your dependencies. Groups them into clusters (Intl, HTTP, UI primitives, lodash), gives you questions to ask before deleting things, and works through a case where a swap can make your bundle bigger (Day.js → Temporal). A familiar theme developed into a rigorous, reusable audit.
Jad Joubran
Making More npm Packages Work with jsDelivr ESM Mode — jsDelivr is a popular CDN used to load npm packages into pages without a build step. This is a thorough, technical tour of what happens when converting packages to browser ESM (via its /+esm endpoint) and all the ways CommonJS finds to make that hard.
Progressive Enhancement Inside of JavaScript — Working on a train, a patchy data connection got Remy to notice users can interact with a page before its JavaScript is ready, with a neat fix being to bind a handler early and replay the intent later.
celld: Durable Objects on Your Own S3 Bucket — A self-hosted take on Cloudflare's Workers and Durable Objects from Deno. V8 plus SQLite and Litestream's LTX coordinate through an S3 bucket with no consensus layer. GitHub repo.
Ryan Dahl (Deno)
😅 On self-hosting Durable Objects with workerd, "You beat us to it!" said Durable Objects creator Kenton Varda on Hacker News, later adding "celld is definitely ahead of us here. No doubt about that."
hucre 1.0: A Zero-Dependency Spreadsheet Engine — An MIT-licensed, tree-shakeable engine for reading and writing common spreadsheet formats, including support for things like embedded images, hyperlinks, password protection, and pivot tables.
Wind
vlt 1.0: An npm Alternative With CSS-Like Selectors — A drop-in npm alternative with a key draw being vlt query, which lets you use 60+ CSS-like selectors over your dependency graph (of which half are security related). vlt also offers hosted private package registries.
Which screen is slow, and on which devices? Expo Observe is production performance monitoring for your mobile app.
🤖 Block bots at login without slowing down real users. No CAPTCHAs, zero friction. Try Fingerprint for free.
⚡ Merget is Git for AI-written code. It reviews every coding session and catches what your agent missed. Free for teams now: merget.ai.
📢 Elsewhere in the ecosystem
The js1024 code golfing contest is over and we have three winners! Skydreams, a Super Monkey Ball-like experience, came in first place. You can read the readable and minified source if you want to see the techniques used.
Docker has entered the agent sandbox game with Docker Sandboxes, a free way to run coding agents in their own microVMs with a Docker daemon inside.
scriptc is a new, experimental TypeScript-to-native compiler from Vercel Labs. With --dynamic, unsupported or dynamic portions are run in a bundled QuickJS engine.
Frontend Architecture: Monoliths to Microfrontends — Maxi Ferreira walks through modular monoliths, monorepos, and microfrontends so you can pick the right structure for your codebase and know the real cost before you commit.
The Secure Way to Release an npm Package in 2026 — A practical guide to publishing npm packages more safely, written by the author of numerous popular packages (e.g. postcss). As well as showing how to use staged publishing and trusted publishing, he explains why they help.
Andrey Sitnik
💡 GitHub is continuing to focus on npm security, and is starting to scan every npm package for malware at publish time. This will have some implications, including a delay between publishing and availability for installation.
MobX 7.0 – The popular state manager slims down, removes deprecations, updates its React bindings, and now always uses Proxy-backed observable objects and arrays.
Javy 9.1 – Toolchain for compiling JavaScript to WebAssembly for WASM runtimes.
Your SPA is Leaking Memory: 'Soak Test' It — How to run a Playwright 'soak test' that loops a user flow within the same browser context, watches DOM node and listener counts, and fails CI when a memory leak creeps in.
Den Odell
Your JSON is Lying to You — A reminder that a JSON.parse/JSON.stringify round-trip is far from lossless, with big integers, undefined, Date, and more, altered or lost along the way. Gabor covers the nastier gotchas and practical ways to make the conversion boundaries explicit.
cdnjs at 9 Billion Requests a Day: A Migration Story — cdnjs is a popular, free CDN for loading JavaScript libraries without bundling or self-hosting (which LLMs really seem to like). Cloudflare explains how it now runs entirely on Workers and R2.
Simona Badoiu (Cloudflare)
Adding Go's defer to the TypeScript Compiler — In Go, defer delays the execution of a function call until the surrounding function finishes. Can you just fork TypeScript and add language features? Yes! Should you? Probably not, as using is already a good fit for the use case.
Andrew Healey
📄 Learning Remix 3 – By porting a Solid 2.0 demo to Remix 3's server-first model. Mark Malstrom
TanStack Charts: A New Chart Grammar Option — In the past few weeks, TanStack has been rapidly iterating on a new, framework-neutral way to declaratively specify a large number of chart-related visualizations in JavaScript. Output renders to SVG or canvas and can be styled as you wish. Here's a comparison against other established options.
🤖 GitHub's Sean Goedecke says LLMs reward expertise, with the most important prompting skill being expertise in the domain you're prompting for.
Microsoft is previewing a way to call native Windows APIs from Node (and therefore Electron) without native addons, via a new dynamic Windows Runtime API (WinRT) projection.
Rust Is Eating JavaScript (Still, in 2026) — Our most-read link of 2021 gets an update for 2026. Lee Robinson (then Vercel, now Cursor) predicted Rust would be used to reimplement more and more JavaScript ecosystem tooling, and Rspack, Biome, Turbopack, and Bun's recent rewrite keep proving him right.
Lee Robinson
Frontend Architecture: Monoliths to Microfrontends — Maxi Ferreira walks through modular monoliths, monorepos, and microfrontends so you can pick the right structure for your codebase and know the real cost before you commit.
Master.dev sponsor
Octane: React's Programming Model, But Compiled — From the creator of Inferno comes a successor: a compiled React-like framework (differences explained here) that generates reactivity ahead of time with no VDOM. Supports TSX/JSX and TSRX, with integrations for TanStack Query and Router, plus other common React libraries.
▶ The Creator of TypeScript Shows Off TypeScript 7 — Anders Hejlsberg demos the 10x speedup gained by the new Go-based TypeScript compiler on VS Code's 1.3M line codebase. He also covers the new LSP language server and why compiler API users (Vue, Astro, Svelte) must stay on TypeScript 6.
Bruno 4.0: An Open-Source HTTP API Client App — An open source, JavaScript-powered lightweight alternative to something like Postman for testing and making requests against HTTP APIs.
Anoop M D, Anusree P S and Contributors
tslog 5: Zero-Dependency Logger for Node, Deno, Bun and Browsers — A ground-up rewrite, now ESM-only, and also covers workers and React Native. Pretty output by default, JSON optionally, plus middleware, file/HTTP/worker transports, secret masking, and error stacks that resolve through source maps to your original .ts lines. GitHub repo.
Eugene Terehov
eslint-package-json: Powerful ESLint Rules for package.json — An ESLint plugin that catches package.json mistakes like invalid names, bad version ranges, broken exports, redundant files entries, and more, and fixes many of them automatically.
Sindre Sorhus
Shadscan: Deterministic UI Audits for shadcn Apps — A tool that statically analyzes your shadcn components using almost 60 deterministic checks (no AI or API keys needed) around fundamental accessibility, state, and composition best practices.
OrcDev
Slick 2.0 – Ken Wheeler's classic jQuery carousel control (demos). Now compatible with jQuery 4.0!
🤖 In How I Stopped Running Out of Tokens, a dev whose company uses Claude Enterprise shares tools you can use (e.g. rtk) to get more out of your limits.
Framework Benchmarks: Compare Frontend Frameworks — An experienced developer built and benchmarked the same app across numerous frameworks (e.g. Angular, Solid, React, Alpine.js…). Here are the results, covering bundle size, build time, UX metrics, and more.
Alicia Sykes
💡 Alicia also created Stack Match, a page that lets you specify your criteria for a framework and shows the best matches. Vue usually wins though!
xyOps: Open Source Ops Automation, from the Cronicle Team — Run jobs across your fleet, build visual runbooks, monitor live metrics, and trigger alerts, tickets, snapshots, or follow-up actions. Self-hosted, BSD licensed, and all app features are included. Auto-import from Cronicle.
xyOps sponsor
Nuxt 4.5 Released: The Full-Stack Vue Framework — Daniel Roe calls it the biggest release in a while: Vite 8, Rspack 2, experimental SSR streaming, a new useLayout composable, and a lot of preparation for Nuxt 5. Nuxt 3 users take note: it goes end of life July 31.
Flint: Chart Specs that Compile to Vega-Lite, ECharts, or Chart.js — A Microsoft project that compiles a simple, declarative JSON-based spec of a data visualization into a form that Vega-Lite, ECharts or Chart.js can render. It's pitched at agentic use, but is a simple intermediate format humans could benefit from too.
BotKit: Build Standalone ActivityPub Bots — A way to run a bot (or multiple bots) that Mastodon users can see and follow but without needing an account anywhere. Write it all in JavaScript and self-host with Deno, Node.js or even Cloudflare Workers.
Fedify
🎨Color.js 0.7: 'Let’s Get Serious About Color' — A fantastic library for working with colors, following the latest specs. v0.7 is a big update with support for new color spaces, a new gamut mapping method, and a smarter display() fallback for colors not natively supported by a browser.
Lea Verou and Chris Lilley
Travels 2.1 – Efficient framework-agnostic undo/redo library based on JSON patches rather than snapshots.
gridstack.js 13.0 – Mature library for creating responsive dashboard layouts with drag-and-drop support.
np 12.0 – Sindre Sorhus's "better npm publish" adds support for npm 12 and staged publishing.
Flaky tests slowing down dev? Meticulous gives engineers confidence to ship faster by autonomously testing every edge case of your web app.
Drowning in AI dev tools? You really only need these 3 tools to ship mobile apps: skills, MCP, and your workflow. Read the guide.
📢 Elsewhere in the ecosystem
Famously, the only thing Java gave JavaScript was the first four letters of its name. That goes unmentioned in ▶️ this new documentary about Java (74 minutes), but I enjoyed learning Java's story anyway. It's from the same folks as the fantastic Vite, Angular, and Node.js documentaries.
🤖 ReactBench is a new coding agent evaluation based around models' abilities to build working, realistic React apps. GPT 5.6 leads the way for now.
shadcn/typeset is a typography system for rendered HTML that makes font styling and spacing simpler to configure.
Cloudflare has entirely rebuilt its blog on top of EmDash, the Astro-powered 'spiritual successor to WordPress' it unveiled (genuinely) on April 1.
🕹️ If you want to take part in the next js13kGames game dev competition, the theme will be announced on August 13 with submissions due September 13.