JavaScript Weekly Issue 751: September 5, 2025

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Why Do Browsers Throttle JavaScript Timers? — Did you know the zero in setTimeout(0) doesn’t really mean zero? Browsers clamp timers to at least a few milliseconds or more, slowing down code that relies on them. Luckily, there are alternative options, which Nolan demonstrates and benchmarks.

Nolan Lawson

Boost Coding Productivity with AI-Assisted Tools & Agents — Join Steve Kinney for this course looking at how best to harness AI for faster, higher-quality code. Learn how Cursor and Claude Code can be used to handle project plans, carry out inline edits, and perform larger background tasks — all adhering to the guidelines you set.

Frontend Masters

IN BRIEF:

RELEASES:

📖 Articles and Videos

Google Chrome Turns 17: A History — A fantastic walkthrough of Chrome’s origins and its evolution over the years. Addy looks at key milestones (multi-process architecture for example), security, its steps into the world of AI, and more.

Addy Osmani

💡 On the topic of Chrome, Top Chrome APIs Every Developer Should Try covers a variety of Chrome-only JavaScript APIs, most of which I wasn’t aware of.

Lean for JavaScript Developers — A comprehensive introduction to Lean, a theorem prover and language for creating formally verified code that Dan Abramov has really been getting into recently. “I’ve never written code alongside proofs like this before. Have you?”

Dan Abramov

JavaScript Weekly Issue 751: September 5, 2025 5

💡 There are other options in this space too, including the newly released Waveform Renderer 1.0 (complete with interactive demo) which is entirely focused on waveform rendering, as well as Wavesurfer.js.

Redux Toolkit 2.9: The ‘Batteries-Included’ Toolset for Redux — The long-standing toolset for working with Redux for state management gets a performance update with a rewrite of RTK Query’s subscription and polling systems, automatic aborting of in-flight requests when a cache entry is removed, and more.

Mark Erikson

serverless-http 4.0 – Use your existing middleware framework (e.g. Express, Koa) on AWS Lambda.
🖋️ Signature Pad 5.1 – Canvas-based smooth signature drawing control.
Tinypool 2.0 – Minimal Node.js worker thread pool implementation.
gRPC Web 2.0 – JS implementation of gRPC for browser clients.
Jasmine 5.10 – Testing framework for browsers & Node.
NodeBB 4.5 – Node.js-powered forum system.
Watt 3 – Node.js application server.

For a variety of reasons – not least taking a vacation in August (oops!) – I have a backlog of fantastic submissions from people that I want to share separately: