hello-world

Hello World

One exported function, no imports:

File	Role
wit/world.wit	greet: func(name: string) -> string
guest/src/lib.rs	Rust implementation using wit-bindgen
host.ts	Load the packaged translator, instantiate, call, and check the greeting

From the repository root:

just shim
./examples/hello-world/run.sh

Requires Deno, Rust with wasm32-unknown-unknown, and wasm-tools. The script builds the guest, componentizes and validates it, type-checks the host, and runs it with read access to the example's build/ directory. Package resolution comes from the repository workspace; see examples before copying the directory out.

instantiate({ componentBytes, translator }, {}) supplies the empty import record. await component.exports.greet(...) uses the default asynchronous host calling convention even though the guest function is synchronous. The runtime copies the returned string out of guest memory and handles canonical post-return cleanup.

Continue with kitchen-sink for imports and other value shapes. The embedder contract is the API reference.