The Linux Foundation
3 HN recommenders · recommended in 4 months, 2024–2026
29:51 · 6.9K views · Sep 11, 2023
Luke Wagner of Fastly explains what a WebAssembly component is, how it relates to familiar concepts, and what the Component Model enables. It emphasizes security, composability and modularity.
HN recommends it as the best starting point for understanding the Wasm Component Model and WASI direction, straight from its designer.
7 comments from Hacker News
WASI preview1 modules aren't very modular. You can't compose them. All you can do is one shot compile & bundle the world into one massive module. You can't use that module to power another module, it basically has to be standalone. Luke Wagner has a talk going through WASI 0.2 that's pretty excellent. The title is What is a component (and why)? , and we go step by step through the properties component-model enables: a Standard Portable Lightweight Finely-Sandboxed Cross-Language Compositional Module . You get basically none of these without component-model. this video The properties are amazing. Not only do we get Cross-Language, not only do we get composable, but ideally we get very very lightweight sandboxed processes that can safely re-use modules already loaded by the runtime. This could be such an incredible way to sandbox actively, with a base of supportinginrsriss dwarfing anything computer science has done before. The wasm view here has been so shortsighted & brutal. Once again, the hype cycle has gotten big enough that a lot of people are very angry & actively trying to tear down & discredit. Like systemd, like K8s. With not even a passing attempt to show balanced views in the process, no nods to the possible or good, just remorseless total war. This is the famous typical dripping sense of disdain, arising again in angry stirrings, here now to rage against component-model. Holy shit yes is it ambitious and hard. Yes you should be afraid of failure, of this crew not pull
I don't think it's fair to say this work has happened in the shadows. I work on CNCF wasmCloud, and I know how hard we try to make this content available. - Many standing meetings organized around SIGs, all on the public community calendar: [LINK] - A dedicated Zulip: [LINK] - Conferences organized around exactly these topics: Wasm Day, WasmCon, Wasm I/O, and the Bytecode Alliance Plumbers Summit - CNCF projects: wasmCloud, Spin - Blogs, many with recordings, summaries, and transcripts: [LINK] , [LINK] , [LINK] If you want the architectural direction straight from the source, Luke Wagner's keynotes are the best place to start: - "What is a Component (and Why)?" (WasmCon 2023): this video - "The Path to Components": [LINK] - "Towards a Component Model 1.0" (Wasm I/O 2026): [LINK] I mean this, though - what else would you like to see to try and make the content and process more accessible? Are there communities that are doing this really well that we could use for inspiration?
Now that there's a canonical ABI as specified by component-model, it seems like the good work can start. As recommended elsewhere in the comments, there's a pretty damned fine talk my Luke Wagner that covers wasm components & the promise. He talks about cross-platform was 18m35s in: this video
I thought this keynote presentation[0] by Luke Wagner at Wasmcon was great and covered it very well. I also found the WIT Format design doc[1] in the component model repo to be the most complete explanation of how it's all going to hang together. [0]: this video [1]: [LINK]
This does such a good job laying out the real fundamentals of what's happening. Capabilities model, component-model; it's well covered and nicely tied together. The WasmCom keynote What is a component? (and why?) by Luke Wagner is also a great intro. this video