src/lib.rs


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use wasm_bindgen::prelude::wasm_bindgen;

#[wasm_bindgen]
extern {
    fn alert(s: &str);

    // set the namespace so we can use ‘console.debug’
    #[wasm_bindgen(js_namespace = console)]
    fn debug(s: &str);
}

#[wasm_bindgen]
pub fn add(left: u32, right: u32) -> u32 {
    debug(&format!("adding the numbers {} and {}",
        left, right));
    left + right
}

#[wasm_bindgen]
pub fn test_alert(s: &str) {
    alert(s)
}