let f;

async function prepare() {
    const get = fetch('07_weird_assembly_machine.wasm');
    const obj = await WebAssembly.instantiateStreaming(get);
    f = obj.instance.exports.f;
}

function onClick() {
    if(n >= 10n**18n) {
        return;
    }
    n++;
    x = BigInt.asUintN(64, f(x, n));
}