WASI API

Development of WASI has moved to the WASI CG Subgroup; see the WASI repository and the interfaces page on wasi.dev.

For Wasmtime embedders using the C API with the component model:

• Add core WASI imports to your component linker with wasmtime_component_linker_add_wasip2.
• If your component imports wasi:http, also add wasmtime_component_linker_add_wasi_http.
• Configure store-local WASI state with wasmtime_context_set_wasi, and initialize WASI HTTP with wasmtime_context_set_wasi_http (after WASI).

See these headers for current signatures and feature-gating details:

• wasmtime/component/linker.h
• wasmtime/store.h

For legacy preview1 documentation, see the preview1 docs.