#​606 — September 16, 2022

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JavaScript Weekly

MemLab: A Framework for Finding JavaScript Memory Leaks — Facebook (sorry, Meta) has been using MemLab to make significant improvements to the memory use of its main SPA. Now they’ve open sourced the tool (which is itself written in TypeScript) with the hope everyone else can achieve similar improvements.

Liang Gong and Glenn Conner (Meta)

💡 Nolan Lawson's Fuite is another, smaller, tool worth considering in this space.

JavaScript APIs You Don’t Know About — It’s a bold headline because plenty of you will have at least heard of these APIs, but it’s a good roundup nonetheless to catch up on what the Web platform offers. APIs covered include the Page Visibility, Web Sharing, and Broadcast Channel APIs.

Smashing Magazine

Frontend Masters Community Sale — Celebrate new community features with $100 off a yearly membership – our first discount in over 3 years! See details.

Frontend Masters sponsor

Best Practices for Creating a Modern npm Package — A step-by-step “as of 2022” walkthrough of creating your own npm package using current best practices. It’s very thorough and certainly worth revisiting, even if you’ve built a package already. As always, though, there’s more than one way to do it, and other tools like np can be brought into the mix as needed.

Brian Clark (Snyk)


  • Safari 16.0 is out and jam packed with new features and support for Web features (passkeys, Web Inspector Extensions, container queries, Shared Workers and more) you might need to brush up on.

  • Node.js is getting some security releases on September 22 across all supported lines due to multiple issues (some of 'high' severity).

  • Talking of Node, 📅 Nodeconf EU 2022 is taking place on October 3-5 in Ireland and they've offered a discount code of NodeWeekly2022 for readers. (Note: We have no financial connection with them.)


📒 Articles & Tutorials

The Seventh Way to Call a Function Without Parentheses — If you’re surprised that there were even six ways, this is for you. These are almost entirely ‘tricks’ but ones that can be important when it comes to security or sanitizing user supplied code.

Gareth Heyes

What’s New with HTML Forms in 2022? — Some useful additions to working with forms that you might have missed…

Ollie Williams

Snyk Finds PyPi Malware That Steals Discord & Roblox Credential and Payment Info — Read about the latest PyPi malware found by the Snyk security research team stealing Discord & Roblox payment info.

Snyk sponsor

The Secret of Successfully Using Multi Window WebGL Canvas — This is technical and most of us won’t need to dig so deep, but it's a neat exploration of using an offscreen canvas to render using separate worker contexts - these can then be used in other tabs or browser windows.

Tobias Uhlig

Why the type="number" Input is the Worst Input — Think that web form has got your number? If you used input type=”number”, you may be surprised to find that it doesn’t.

Jared Toporek

useSyncExternalStore: The Underrated React Hook? — A hook for subscribing to external data sources. But did you know it can also be used to stop over-returning React hooks triggering needless re-renders?

Sébastien Lorber

Conditionally Spreading Objects in JavaScript — A technique I've not seen before.
Amit Merchant

Multithreading in JavaScript with Web Workers
Badmus Kola beginner

A Guide to Rounding Numbers in JavaScript
Darren Jones beginner

🛠 Code & Tools

npm-check-updates: Update package.json Dependencies to the Latest Versions — That is, as opposed to the specified versions. A particularly neat feature is the -i interactive mode so you can look at potential upgrades and then action them one by one.

Raine Revere

❤️ Loving console.log Is Easy, but hate 😡 Losing Context to View Messy Output — Developer productivity tools Wallaby.js, Quokka.js, and Console Ninja (coming soon) show console.log values and errors right next to your code.

Wallaby.js sponsor

SafeQL: An ESLint Plugin for Your SQL Queries — Clever idea. It hooks into your database and then guides you as to mistakes you might make when writing SQL queries in your JavaScript code. Postgres only for now, but supports any client.. whether Prisma, pg, Sequelize, or whatever.


Theatre.js 0.5: Hackable Motion Design for the Web — Can be used both programmatically and visually to animate 3D objects created with things like Three.js, React Three Fiber, HTML/SVG, or even to ‘animate’ variable values. v0.5 introduces 3D scene editing and complex keyframing. Docs and GitHub repo.

Theatre.js Project

Code Capsules: The Simplest Way to Deploy Your Code

Code Capsules sponsor


💻 Jobs

Senior UI Dev — Join us and innovate with MicroFrontends, custom Node tools, build systems (Webpack/Github Actions), TypeScript, React, and more with a11y and DX in mind.
Vertex Inc

Find JavaScript Jobs with Hired — Create a profile on Hired to connect with hiring managers at growing startups and Fortune 500 companies. It's free for job-seekers.


🕹 Infernal Throne is a small Metroidvania-style game written for the js13kGames JavaScript coding competition. Source available here.

A key part of delivering Infernal Throne within a mere 13 kilobytes is the use of Roadroller, a tool we linked to a year ago, which is specifically designed to crush JavaScript code down as small as possible (so much so that it's almost entirely unreadable).