wit
WIT (WebAssembly Interface Types)
WIT is the Interface Definition Language (IDL) for the WebAssembly Component Model. It defines typed contracts between components in a language-agnostic way, enabling interoperability across programming languages at the wasm boundary.
See also: wasmtime skill for runtime embedding and compilation details.
When to Use This Skill
Activate when:
- Writing
.witfiles to define component interfaces - Designing worlds for WebAssembly components
- Understanding the Component Model type system
- Using
cargo-component,wit-bindgen, orwasm-tools - Mapping WIT types to host language types (Rust, Go, Python, JavaScript)
- Structuring packages and namespaces for wasm components
- Composing components via shared interfaces
WIT File Structure
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