A Bytecode Alliance project

This crate contains bindings for WASIp3 APIs for the worlds:

• wasi:cli/command
• wasi:http/proxy

This crate is procedurally generated from WIT files using wit-bindgen.

Usage

Depending on this crate can be done by adding it to your dependencies:

$ cargo add wasip3

Using this crate requires Rust 1.90.0. If you're using this before 2025-09-18 you'll want to use the beta channel of Rust. You'll also want to use this crate with the wasm32-wasip2 target (the Rust compiler does not currently have a wasm32-wasip3 target).

Development

The bulk of the wasip3 crate is generated by the wit-bindgen tool. The src/bindings.rs file can be regenerated with:

$ ./ci/regenerate.sh

WASI definitions are located in the wit directory of this repository. Currently they're copied from upstream repositories but are hoped to be better managed in the future.