<pre class="shiki github-dark shaku"><code>/*type Callback = (error: Error, data: any) =&gt; voidtype AsyncFunc = ( callback: Callback, data: any) =&gt; void*//** * @param {AsyncFunc[]} funcs * @return {(callback: Callback) =&gt; void} */function sequence(funcs){ return function innerFunction(cb, num) { if(funcs.length === 0) { return cb(undefined, num); } funcs.shift()((error, data) =&gt; { if(error) { cb(error, data); } else { innerFunction(cb, data); } }, num) }}</code></pre>

Accepted Solution without Promise

This problem is similar to 11. what is Composition? create a pipe(). You are asked to implement an async function helper, sequence() which chains up a…