Running wasm-bindgen

Note: Usage of wasm-bindgen and WebAssembly Interface Types is highly experimental, it's recommended that you expect breakage and/or surprises if you're using this.

Note: When building your crate with WebAssembly Interface Types enabled via wasm-bindgen, due to a bug in wasm-bindgen, it is currently necessary to build in release mode, i.e., cargo wasi build --release.

The wasm-bindgen project is primarily targeted at JavaScript and the web, but is also becomimg the primary experiment grounds of WebAssembly Interface Types for Rust. If you're not using interface types you probably don't need wasm-bindgen, but if you're using interface types read on!

The cargo wasi subcommand will automatically detect when wasm-bindgen-the-crate is used in your dependency graph. When this is seen then cargo wasi will download the corresponding precompiled wasm-bindgen CLI binary (or cargo install it) and execute that over the final WebAssembly file.

Currently no configuration for wasm-bindgen is supported because the support for WebAssembly Interface Types is unconditionally enabled which takes no configuration. This aspect of cargo wasi is highly likely to change and get improved over time though!