Ever wondered how source maps actually work? In this episode, Nicolo Ribaudo, Babel maintainer and TC39 delegate, breaks down how source maps connect your JavaScript, TypeScript, and CSS back to the original code — making debugging, stack traces, and observability smoother in Chrome dev tools.

We dive into how source maps help in both development and production with minified code, explore tools like Webpack, Rollup, Next.js, and Svelte, and share when you should turn off source maps to avoid confusion.

Website: https://nicr.dev

Squiggleconf talk: https://squiggleconf.com/2025/sessions#source-maps-how-does-the-magic-work

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00:00 Intro – Welcome to PodRocket + Introducing Nicolo Ribaudo

Andreas Rossberg unpacks WASM 3.0, covering new capabilities like garbage collection, exception handling, tail calls, and support for 64-bit addressing with multiple memories. The discussion explores deterministic profiles following relaxed sim, WebAssembly’s capability-based security model, and advances in sandboxing and module design. Andreas connects these features to practical use cases in JavaScript engines and applications like Google Sheets, then looks ahead to experimental work on threading, stack switching, and async programming models shaping the next phase of the WebAssembly ecosystem.

Website: https://people.mpi-sws.org/~rossberg

WASM 3.0 Completed: https://webassembly.org/news/2025-09-17-wasm-3.0

00:00 Intro – Andreas Rossberg and the WebAssembly 3.0 Update

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Jono Alderson joins the podcast to discuss why semantic HTML still matters today. He shares how thoughtful markup can improve accessibility and performance, from using the picture tag and responsive images to optimizing with content-visibility CSS. The conversation dives into common pitfalls like div soup, the shift toward more template-centric design, and techniques for improving the critical rendering path. Jono also discusses preloading, HTTP early hints, and the evolving role of structured data, LLMs, and Google’s trust signals in shaping a more meaningful and efficient web.

Website: https://www.jonoalderson.com

Why semantic HTML still matters: https://www.jonoalderson.com/conjecture/why-semantic-html-still-matters/

00:40 Meet Jono Alderson: SEO Consultant and Web Performance Expert

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In this episode of PodRocket, Adam Argyle and Kevin Powell discuss the results of the latest State of CSS survey and share how new capabilities like functions, mixins, nesting, and container queries are changing the way developers approach styling. We dive into the ongoing conversation around Tailwind and pre-processors, and look at the practical impact of features such as scroll driven animations, view transitions, and cascade layers. Adam and Kevin also explain how advances like relative color syntax and app property are making CSS variables more dynamic and reliable. Along the way, we touch on browser interoperability and imagine what’s ahead for CSS, from motion blur to fit text and beyond.

Adam Argyle

Kevin Powell

State of CSS 2025: https://2025.stateofcss.com

01:00 Why CSS Remains Irreplaceable

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Special Guests: Adam Argyle and Kevin Powell.

Is the web breaking under the weight of AI crawlers, platform consolidation, and nonstop security breaches? We dive into the state of browsers, developer burnout, and whether tech regulation can actually keep up.

In this panel discussion:

Inside the battle for the future of the web: https://www.businessinsider.com/google-microsoft-openai-fight-standards-limit-ai-access-websites-2025-9

The web has a new system for making AI companies pay up: https://www.theverge.com/news/775072/rsl-standard-licensing-ai-publishing-reddit-yahoo-medium

The Browser Company, maker of Arc and Dia, is being acquired: https://www.theverge.com/web/770947/browser-company-arc-dia-acquired-atlassian

Google stock jumps 8% after search giant avoids worst-case penalties in antitrust case: https://www.cnbc.com/2025/09/02/google-antitrust-search-ruling.html

Massive data breach sees 16 million PayPal accounts leaked online - here's what we know, and how to stay safe:https://www.techradar.com/pro/massive-data-breach-sees-16-million-paypal-accounts-leaked-online-heres-what-we-know-and-how-to-stay-safe

PayPal’s Glitch Puts €10 Billion on Ice Across European Banks: https://fintechnews.ch/payments/paypal-glitch-freezes-european-banks-10-billion-transactions/77974/

npm Author Qix Compromised via Phishing Email in Major Supply Chain Attack: https://socket.dev/blog/npm-author-qix-compromised-in-major-supply-chain-attack

Compromised files replace npm packages with a combined 2 billion weekly downloads: https://www.techradar.com/pro/security/compromised-files-replace-npm-packages-with-a-combined-2-billion-weekly-downloads

Shai-Hulud: Ongoing Package Supply Chain Worm Delivering Data-Stealing Malware: https://www.wiz.io/blog/shai-hulud-npm-supply-chain-attack

Coinbase CEO explains why he fired engineers who didn’t try AI immediately: https://techcrunch.com/2025/08/22/coinbase-ceo-explains-why-he-fired-engineers-who-didnt-try-ai-immediately/

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Feross Aboukhadijeh, founder of Socket, joins us to break down the recent wave of NPM supply chain attacks hitting the JavaScript ecosystem, including how attackers used phishing to target developers, snuck malware into popular packages like Prettier and "is", and even abused tools like Claude, Gemini, and TruffleHog.

Website: https://feross.org

npm Author Qix Compromised via Phishing Email in Major Supply Chain Attack: https://socket.dev/blog/npm-author-qix-compromised-in-major-supply-chain-attack

00:00 Intro: NPM supply chain attacks explained

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Special Guest: Feross Aboukhadijeh.

Mark Dalgleish joins us to talk about the latest in React Router, including its growing support for React Server Components (RSC). He breaks down what RSC data mode, framework mode, and declarative mode mean for developers, and how features like the middleware API and route module API are simplifying work across tools like Vite and Parcel.

We also dive into how React 19, static site generation with RSC, and smarter data batching are reshaping performance and the future of server-side rendering in React apps.

X: https://x.com/markdalgleish

React Router and RSC: https://remix.run/blog/react-router-and-react-server-components

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Special Guest: Mark Dalgleish.

Jimmy Bogard joins Pod Rocket to talk about making monoliths more modular, why boundaries matter, and how to avoid turning systems into distributed monoliths. From refactoring techniques and database migrations at scale to lessons from Stripe and WordPress, he shares practical ways to balance architecture choices. We also explore how tools like Claude and Lambda fit into modern development and what teams should watch for with latency, transactions, and growing complexity.

Website: https://www.jimmybogard.com

Modularizing the Monolith - Jimmy Bogard - NDC Oslo 2024: https://www.youtube.com/watch?v=fc6_NtD9soI

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Special Guest: Jimmy Bogard.

Alexander Lichter joins the podcast to talk about Rolldown, a bundler built in Rust by Void Zero that aims to replace Rollup and ESBuild with faster builds and better enterprise scalability. He dives into the power of OXC and Oxlint, the push toward a unified JavaScript toolchain, and previews what to expect at ViteConf 2024.

X: https://x.com/TheAlexLichter

Rolldown: How Vite Bundles at the Speed of Rust: https://squiggleconf.com/2025/sessions#rolldown-how-vite-bundles-at-the-speed-of-rust

Rolldown: https://rolldown.rs

Benchmarks:

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Special Guest: Alexander Lichter.

Dominik Dorfmeister unpacks the pitfalls of React’s useCallback and useMemo, revealing how these hooks often introduce more complexity than performance gains. He explores the promise of the React Compiler, the practical power of the “latest ref” pattern, and strategies to boost code readability and maintainability at scale.

Learn why overusing useEffect and manual memoization can do more harm than good, and how teams can level up their PR reviews and performance practices using tools like the ESLint React Compiler plugin.

Bluesky: https://bsky.app/profile/tkdodo.eu

The Useless useCallback: https://tkdodo.eu/blog/the-useless-use-callback

00:00 Why talk about useCallback and useMemo

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Special Guest: Dominik Dorfmeister.