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% to96%.

Shawn Walton (Yelp)

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 fromthere.

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 duecourse.

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, reusableaudit.

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 thathard.

Martin Kolrik (jsDelivr)

Join Sentry Live: How Etsy Stays Crash-Free Sentry and Etsy break down how they prep for peak traffic and debug in realtime.

Sentry sponsor

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 intentlater.

Remy Sharp

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. GitHubrepo.

Ryan Dahl (Deno)

That Slow Tab Isn't the UI. It's the Query TimescaleDB extends Postgres so queries stay fast at scale, straight from live data. Get $1000 credit tostart.

Tiger Data (creators of TimescaleDB) sponsor

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 pivottables.

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 packageregistries.

Darcy Clarke

TanStack Table v9: A Faster, More Modular Foundation The headless table library gets a tree-shakeable architecture, state moves to TanStack Store for fine-grained reactivity, and there are big memory wins for largedatasets.

Kevin Van Cott