PokeAPI: Uncaught TypeError: (intermediate value) is not a function

Question

我正在使用 PokeAPI，浏览器端使用 PokeAPI js 包装器 CDN。

HTML：

<script src="https://unpkg.com/pokeapi-js-wrapper/dist/index.js"></script>
<script src="/scripts/app.js" defer></script>

我从包装库的文档中复制了代码： https://github.com/PokeAPI/pokeapi-js-wrapper#install

这是我的 app.js 中的内容：

const P = new Pokedex.Pokedex()
    // with await, be sure to be in an async function (and in a try/catch)
    (async() => {
        const golduck = await P.getPokemonByName("golduck");
        console.log(golduck);
    })();

它抛出这个错误：

app.js:3 Uncaught TypeError: (intermediate value) is not a function
    at app.js:3
(anonymous) @ app.js:3