#​680 — March 21, 2024

Read on the Web

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JavaScript Weekly

Runtime Compatibility Across JavaScript Runtimes — Several developers have come together to build this convenient way to visualize the compatibility of different Web APIs and JavaScript features across the ever increasing number of different runtimes (e.g. Bun, Deno, Node, LLRT..)

Tom Lienard et al.

✅ The item above reminds me of node.green, a visualization of JS feature support across versions of Node / V8, though it is nearly entirely green/Yes these days!

Introducing the Vlt (/vōlt/) Team — Last summer, Darcy Clarke (who used to work on the npm CLI team) wrote about a massive bug at the heart of the npm ecosystem around the security of manifests. Now, he’s teamed up with npm creator Isaac Z. Schlueter and fellow npm CLI team alumnus Ruy Adorno to work on… a new package manager and registry. (Yes, Brenda, ▶️ another one!)

vlt /vōlt/

Register for POST/CON 24! (April 30 - May 1, 2024) — Postman’s annual user conference will be one of 2024’s biggest developer events and a chance to network while growing your API skills! Connect with the global API community, hear from industry leaders, and take part in hands-on workshops.

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Save 30% on Your POST/CON Ticket! — Time is running out to save 30% on POST/CON 24. Don't miss out on Postman’s biggest user conference ever.

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📒 Articles & Tutorials

📉 Optimizing JavaScript for Fun and for Profit — A tour of several things to avoid to keep your code running fast and smooth, complete with examples. While the performance ground upon which we walk is often shifting, many of these things are good, common sense practices.

Rom Grk

Bringing require(esm) to Node.js — Joyee writes about landing experimental support for require()-ing synchronous ES modules in Node, a feature that has been a long time coming.

Joyee Cheung

FusionAuth’s New Vue, React And Angular SDKs — These JavaScript SDKs simplify authentication integration into React, Angular, or Vue apps, allowing you to focus on user features while ensuring top-tier security.

FusionAuth sponsor

How Figma Built a Custom Permissions DSL — Figma has a complex permissions setup, the implementation of which was causing tech debt, bugs, and delays. After not finding any open source answers, they built a DSL that isolated policies and data while also being cross-platform (Ruby and TypeScript.)

Jorge Silva (Figma)

Building a Node App with TypeScript — How to set up a seamless TypeScript development experience for bundling modern Node apps with pnpm and ES modules, by someone who certainly knows a few things about TypeScript.

Matt Pocock

Type Predicate Inference: The TS 5.5 Feature No One Expected — And another from Matt, who’s getting excited about the forthcoming inclusion of type predicate inference from function bodies in TypeScript 5.5.

Matt Pocock

WebSockets vs Server Sent Events vs Long-Polling vs WebRTC vs WebTransport
RxDB Docs

🛠 Code & Tools

Atrament 4.0: Library for Smooth Canvas Drawing and Handwriting — A small library for beautiful drawing and handwriting on canvas elements. It’s been around for several years but v4.0 is almost a complete rewrite. GitHub repo.

Jakub Fiala

MistCSS: Write React Components with Just CSS — Forget about CSS-in-JS.. what about JS-from-CSS? This approach provides a way to compile CSS-only React components into a TypeScript equivalent. (Code example.)


MicroDiff: No Dependency Object and Array Comparison Library — Given two objects or arrays, it returns the differences (think diff but for JavaScript objects). Boasts high performance and TypeScript support. There’s also an article from 2022 about how it works.


Transformational Auth & Identity | Userfront — Userfront is an auth & identity platform that transforms your business to serve free, freemium and enterprise customers.

Userfront sponsor

oneRepo 1.0: A New Suite of Monorepo Tools for Teams — There always seems to be discontent when JS monorepo management tools get discussed, but maybe Paul’s approach could win you over?

Paul Armstrong

Eta 3.4: Embedded JS Template Engine for Node, Deno, & Browsers — Boasts being lighter and faster than EJS but with many of the same features (it looks a lot like Ruby’s ERB, if you like that vibe). GitHub repo.

Ben Gubler

TanStack Virtual 3.2: Headless UI for Virtualizing Large Element Lists — Supporting TS/JS, React, Solid, Svelte and Vue, this is a way to build 60 fps experiences even with large numbers of elements while retaining full control over markup and style.

Tanner Linsley

React Data Grid: A Fast Excel-Style Data Grid Component — A fantastic live demo shows off all of this component’s unique features, from grouping rows and columns to handling a million cells without slowdowns. Works with React 18+. GitHub repo.