wasmeld/components/echo/src/lib.rs

//! Smallest request/response Component example: it returns input bytes unchanged.

mod bindings {
    // Generate the guest trait and export adapter from the selected WIT world.
    // Dependency sync must populate `wit/deps` before this macro is compiled.
    wit_bindgen::generate!({
        path: "wit",
        world: "echo-component",
    });
}

struct Echo;

impl bindings::Guest for Echo {
    fn init(_config: Vec<u8>) -> Result<(), bindings::ServiceError> {
        Ok(())
    }

    fn invoke(input: Vec<u8>) -> Result<Vec<u8>, bindings::ServiceError> {
        Ok(input)
    }
}

bindings::export!(Echo with_types_in bindings);