<pre class="shiki github-dark shaku"><code>/** * @param {(...args) =&gt; void} func * @returns {(...args) =&gt; Promise&lt;any&gt;} */function promisify(func) { return function (...args) { return new Promise((resolve, reject) =&gt; { func.call(this, ...args, (error, data) =&gt; { if (error) { reject(error); } else { resolve(data); } }); }); };}function getData(callback) { setTimeout(() =&gt; { const success = true; if (success) { callback(null, "Data received successfully"); } else { callback("Something went wrong"); } }, 1000);}const getDataPromise = promisify(getData);getDataPromise() .then((data) =&gt; { console.log(data); }) .catch((error) =&gt; { console.log(error); });</code></pre>

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Let's take a look at following error-first callback. const callback = (error, data) => { if (error) { // handle the error } else { // handle the data …