<pre class="shiki github-dark shaku"><code>/** * @param {(...args) =&gt; void} func * @returns {(...args) =&gt; Promise&lt;any} */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); } }); }); }}</code></pre>

This is my accepted solution

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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 …