In this episode of WasmAssembly, host Thomas Steiner welcomes Thomas Lively from Google, the new co-chair of the W3C WebAssembly Community Group. Taking over the role from past guest Deepti Gandluri (episode #2), we seize the opportunity to ask Lively the exact same three questions we posed to Deepti—listen back to compare their perspectives! In the second half, the two Thomases dive deep into the proposals Lively is personally championing, covering Custom Descriptors and JS Interop, and the highly-anticipated Shared-Everything Threads.

Chapters:

0:00 - The Wasm team "Thomas" confusion

0:57 - Thomas' way into Google's Wasm team

4:10 - Wasm CG vs. Wasm WG

9:39 - Is Wasm standardization moving slowly?

17:58 - Wasm at Google and the Chrome team

22:33 - The Custom Descriptors and JS Interop proposal

35:02 - The Shared-Everything Threads proposal

43:28 - Wasm, but not

Resources:

• Thomas Lively on LinkedIn → https://goo.gle/45U8uRA

• WebAssembly Community Group → https://goo.gle/3K0qSj3

• From asm.js to Wasm with Emscripten creator Alon Zakai → https://goo.gle/47zQTj9

• CG, WG, W3C, Deepti—Wasm standardization with Deepti Gandluri → https://goo.gle/4ndWX5X

• Custom Descriptors and JS Interop → https://goo.gle/4ggStbY

• WebAssembly threads →​​ https://goo.gle/45Z0kaI

• Shared-Everything Threads → https://goo.gle/47BnLYG

• Thomas Lively on Bluesky → https://goo.gle/4gcm2v8

In this episode of WasmAssembly, your host Thomas Steiner is joined by Ömer Ağacan and Martin Kustermann from the Dart team at Google. They explore Dart, the language behind Flutter, and how Dart nearly landed in V8 alongside JavaScript, and why Flutter doubled down on Dart and WebAssembly Garbage Collection (WasmGC). Ömer and Martin then share insights on Dart’s performance leap from dart2js to dart2wasm, its potential beyond the browser, and what the WasmGC transition means for developers and the broader ecosystem. Finally, they look at Jaspr, Dart-only web apps, or how different browsers are handling WasmGC. This episode again is packed with sharp technical detail and bold visions for the future of WebAssembly.

Resources:

• Dart → https://goo.gle/4kfijgD

• Flutter → https://goo.gle/4kh4jDi

• Before Flutter | Rubber Duck Engineering | Episode #100 → https://goo.gle/4nujV9g

• State of Developer Ecosystem Report → https://goo.gle/4lrmya6

• What's new in Flutter → https://goo.gle/44xx0Gl

• Dart & Flutter momentum at Google I/O 2025 → https://goo.gle/3TgUr1p

• Accessibility in Flutter on the Web → https://goo.gle/4l2xfQB

• Stateful hot reload in DartPad → https://goo.gle/4nokFg1

• WebAssembly (Wasm) compilation → https://goo.gle/3I8Ngpx

• Support for WebAssembly (Wasm) → https://goo.gle/45L0wdR

• WebAssembly Garbage Collection (WasmGC) now enabled by default in Chrome → https://goo.gle/3G7qLAS

• Wasm-feature-detect library → https://goo.gle/4evqS5Y

• A new way to bring garbage collected programming languages efficiently to WebAssembly → https://goo.gle/4keW0rt

• [dart2wasm] Support non-JS wasm runtimes → https://goo.gle/44wr3t3

• Safari bug: Umbrella: Using Canvas image sources between different canvases and canvas types is slow → https://goo.gle/3TmuSvM

• Firefox bug: OffscreenCanvas.transferToImageBitmap incurs a copy → https://goo.gle/3GoIGD2

• Ömer Ağacan on LinkedIn → https://goo.gle/4lA6fYB

• Martin Kustermann on LinkedIn → https://goo.gle/3TffQbc

On this WasmAssembly podcast episode, host Thomas Steiner speaks with David Kircos from Quadratic. They discuss how Quadratic's spreadsheet utilizes WebAssembly to enable scientific computing directly in the browser, leveraging tools like Pyodide, pandas, and numpy. The conversation also covers practical challenges such as bundling large-scale Wasm applications, exploring browser limitations, and Quadratic's integration of AI.

Resources:

• David Kircos on LinkedIn → https://goo.gle/4jcpQg6

• Building on the modern web app architecture → https://goo.gle/4hPpcnH

• Pyodide → https://goo.gle/445YEv9

• Pandas → https://goo.gle/4ldvkcp

• Numpy → https://goo.gle/3E1qSNb

• Esbuild-wasm → https://goo.gle/4hRqNJL

• Using JavaScript in a spreadsheet → https://goo.gle/3XIRk4W

• Making API requests from your spreadsheets → https://goo.gle/3FQQPja

• Quadratic Python roadmap: building a spreadsheet developers love → https://goo.gle/446dLot

• ES module integration proposal → https://goo.gle/3C8wd3L

• AI spreadsheets are here: Quadratic + GPT → https://goo.gle/4hZpFUB

• Database connectors → https://goo.gle/3QXMs8g

• SQLite Wasm → https://goo.gle/3FSn3dW

• Quadratic's GitHub organization → https://goo.gle/4jhWqNY

Feature phones? Yes, they still make them. And they run Wasm! In this WasmAssembly podcast, Thomas Steiner hosts Thomas Barrasso from CloudMosa to talk about the Cloud Phone platform and what it takes to run WebAssembly on tiny feature phones by streaming Web apps from a remote server that runs Chromium.

Resources:

• Thomas Barrasso on LinkedIn → https://goo.gle/3Fxbvwg

• CloudMosa (Puffin) → https://goo.gle/42bNe7M

• Cloud Phone → https://goo.gle/4c0xfwB

• Building web apps for Cloud Phone → https://goo.gle/4bz1Pxn

• Cloud Phone simulator → https://goo.gle/4c0fRYZ

• KaiOS → https://goo.gle/4kx6C6z

• Puffin Cloud Isolation → https://goo.gle/4bFMxqK

• Telegram client for KaiOS → https://goo.gle/3DRL581

• Wasm implementation of algorithms used in Telegram → ​​ https://goo.gle/43PTDH1

• Stolen Focus book → https://goo.gle/43PTDH1

• Reach out → https://goo.gle/4bY9BRs

• Thomas' email: barrasso@cloudmosa.com

In this WasmAssembly podcast episode, Sean Isom and Mendy Berger from renderlet join host Thomas Steiner. Discover renderlet, a WebAssembly framework for writing graphics code that runs on any platform.

Resources:

• Mendy Berger on LinkedIn → https://goo.gle/4b1y205

• Sean Isom on LinkedIn → https://goo.gle/4hyO8Rb

• Renderlet → https://goo.gle/3QsfjRy

• renderlet Wasm I/O talk → https://goo.gle/42Z4nm4

• renderlet Wasm I/O slides → https://goo.gle/4b7qCs1

• Drawing to canvas in Emscripten → https://goo.gle/4i4Kazu

• Multi-draw indirect GPU feature → https://goo.gle/3EH8zNg

• Mesh shaders → https://goo.gle/40Y2Jyu

• Work graphs → https://goo.gle/42X96ot

• When in doubt, writeBuffer() → https://goo.gle/4jWjLWm

• Fine grained control of memory proposal → https://goo.gle/4hHMvkj

• Streams.wit → https://goo.gle/4gHkQhT

• wasi-gfx talk: → https://goo.gle/4gU0tyo

• wasi-gfx proposal → https://goo.gle/3QmYY0z

• Web IDL → https://goo.gle/3X7Ea10

• WIT → https://goo.gle/3CYzp2W

• Webidl2wit → https://goo.gle/412whef

• Mendy Berger on Mastodon → https://goo.gle/3D7XPXH

• Sean Isom on X → https://goo.gle/41lY5vN

WebAssembly is known for its speed and security, but can it be applied to enhance application security as a whole? Join Arcjet's CEO David Mytton and host Thomas Steiner on WasmAssembly as they delve into Arcjet’s innovative use of Wasm for crucial security functions like bot detection, rate limiting, and data redaction, providing developers with a powerful yet manageable security toolkit.

Resources:

• Squishy Wasm apps using Extism with Dylibso's Steve Manuel - WasmAssembly → https://goo.gle/3VFcf7J

• David Mytton's blog → https://goo.gle/3C7kXFv

• Console Devtools podcast episode with Fermyon's Matt Butcher → https://goo.gle/3C8mQBQ

• Arcjet → https://goo.gle/40r7dNH

• Arcjet Wasm blog posts → https://goo.gle/3WqTNQG

• Arcjet example app → https://goo.gle/3E3We5n

• @arcjet/next package → https://goo.gle/3DXvyDh

• Arcjet JS SDK → https://goo.gle/4h4UyqY

• Jco → https://goo.gle/4ecjdIC

• jco example → https://goo.gle/4gwhBLu

• Wasm-bindgen → https://goo.gle/3WrZVs0

• Arcjet-js PR where we switched, with some comments on reasoning → https://goo.gle/4hHkJEf

• Componentize-py → https://goo.gle/3CdOUUn

• Componentize-dotnet → https://goo.gle/42oiNMu

• ComponentizeJS → https://goo.gle/3OUNjFG

• Wasm Interface Type (WIT) → https://goo.gle/4fnXMFf

• Extism → https://goo.gle/3E5waa2

Join Thomas Steiner as he chats with Thorsten Hans, Senior Cloud Advocate at Fermyon, about the exciting world of WebAssembly serverless functions and microservices with the Spin framework. Discover how Spin uses WebAssembly for lightning-fast cold starts and great portability, and explore the advantages of building microservice applications with Spin's diverse language support. Thorsten and Thomas also delve into the role of WebAssembly standards in shaping the future of cloud-native development. Tune in for this insightful conversation on the cutting edge of WebAssembly technology!

Resources:

• Thorsten Hans' Fermyon blog posts → https://goo.gle/3ZCRJpL

• Thorsten Hans on X → https://goo.gle/49xok4J

• Thorsten Hans' blog → https://goo.gle/49xooBv

• Thorsten Hans on LinkedIn → https://goo.gle/3Dh9frZ

• Thorsten Hans on joining Fermyon → https://goo.gle/3PeO7pb

• Till Schneidereit on LinkedIn → https://goo.gle/49ApA73

• Fermyon Spin → https://goo.gle/3ZQdTGb

• Introducing Spin → https://goo.gle/3VBBeZI

• Fermyon Spin on GitHub → https://goo.gle/3VEEymR

• Building Spin Components in JavaScript → https://goo.gle/3ZCSZct

• WasmAssembly episode "Squishy Wasm apps using Extism with Dylibso's Steve Manuel": → https://goo.gle/3VFcf7J

• Spin JS/TS SDK → https://goo.gle/41zjrGw

• ComponentizeJS → https://goo.gle/3OUNjFG

• WASI HTTP → https://goo.gle/3MQvK8L

• SpiderMonkey → https://goo.gle/4gIR1Ps

• StarlingMonkey → https://goo.gle/3De6IyM

• Spin Rust SDK → https://goo.gle/49zRznq

• Spin SQLite storage → https://goo.gle/4iATEUo

• Spin Serverless AI → https://goo.gle/49yWvJa

Join host Thomas Steiner and Steve Manuel from Dylibso as they dive deep into the world of "squishy" Wasm applications. Steve discusses Dylibso's mission to make all software squishy, using Wasm to unlock flexibility and extensibility in software development. The episode explores Dylibso's projects like Extism and Chicory, and how Extism is being used in production with Wasm today. Come for the Extism logo, and stay for Tom's provocative questions on Extism's role in the WebAssembly ecosystem.

Resources:

• Steve Manuel on LinkedIn → https://goo.gle/4fliZj5

• Steve Manuel on X → https://goo.gle/3YPgfmW

• Dylibso → https://goo.gle/48QR9sG

• XTP → https://goo.gle/4fG11aL

• Extism → https://goo.gle/3O564Ws

• Observe → https://goo.gle/3UNW2N6

• Chicory → https://goo.gle/40Jb0rG

• Some Extism integrators → https://goo.gle/3O69Y1e

• Extism logo → https://goo.gle/3Z1Qykh

• Run an Extism plugin → https://goo.gle/4futaSr

• Write an Extism plugin → https://goo.gle/4es7wwL

• Extism plugins without officially supported plugin development kit → https://goo.gle/4eybRP4

• WebAssembly Component Model → https://goo.gle/3AQzapo

• Wasm Interface Type (WIT) → https://goo.gle/4fnXMFf

• WebAssembly System Interface (WASI) → https://goo.gle/4duTBpv

• Why Extism → https://goo.gle/3UOfXvu

• Extism performance blog post → https://goo.gle/3Z4puBg

• Beyond the HTTP API: WebAssembly and the Future of Systems Integration → https://goo.gle/4euyP9U

• Enhance Wasm → https://goo.gle/4hMzEgV

• Alone (survival show) → https://goo.gle/3CqP0Yo