<pre class="shiki github-dark shaku"><code>/** * @param {Promise&lt;any&gt;} promise * @param {() =&gt; void} onFinally * @returns {Promise&lt;any&gt;} */function myFinally(promise, onFinally) { // your code here return promise.then(res =&gt; { return Promise.resolve(onFinally()).then(() =&gt; res); }).catch(error =&gt; { return Promise.resolve(onFinally()).then(() =&gt; Promise.reject(error)); })}</code></pre>

My solution

Promise.prototype.finally() could be used to run a callback when a promise is settled(either fulfilled or rejected). Notice that the callback passed f…