An introduction to the WebAssembly component model
summary
WebAssembly components add a richer interface layer (WIT) so polyglot modules interoperate without shared memory; a Rust host embeds a Wasm runtime and dynamically loads JS and Rust components that implement a transform API (uppercase, reverse) and the demo runs them live. Components stay tiny — a Rust component is about 19 kilobytes — and integrate with serverless frameworks like Spin and standard worlds such as HTTP proxy so the same HTTP handler binary runs across different hosts.
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chapters (10)
- 0:00WebAssembly component model intro
- 1:09What is WebAssembly
- 4:22Component model definition
- 7:54Building hosts with components
- 9:17Live demo: component composition
- 12:28Standardized worlds
- 14:12WebAssembly vs containers
- 15:58Use cases for plugins
- 16:39Key takeaways
- 17:21Workshop and resources
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