Checks if the given argument is an async function.

const isAsyncFunction = val =>
 Object.prototype.toString.call(val) === '[object AsyncFunction]';

isAsyncFunction(function() {}); // false
isAsyncFunction(async function() {}); // true

Checks if the given argument is an <code class="notranslate">async</code> function.
<ul>
<li>Use <a target="_blank" rel="nofollow noopener noreferrer" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString" target="_blank" rel="noopener noreferrer"><code class="notranslate">Object.prototype.toString()</code></a> and <a target="_blank" rel="nofollow noopener noreferrer" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/call" target="_blank" rel="noopener noreferrer"><code class="notranslate">Function.prototype.call()</code></a> and check if the result is <code class="notranslate">&#39;[object AsyncFunction]&#39;</code>.</li>
</ul>

Value is async function

Written by Angelos Chalaris

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