Error ymaps is not defined on asynchronous loading. How to decide?

Question

JavaScript

To speed up the loading of the site for Google Page Speed, I use the asynchronous loading of the yandex maps API.

<script async="async" src="https://api-maps.yandex.ru/2.1/?lang=ru_RU"></script>

I load the map code inside:

window.addEventListener('DOMContentLoaded', function() {
...
});

Everything works without async. How to be with him? Inside what to load the card code?

Answer 1

Read this and I think if you read carefully, you will not try to load asynchronously.