Now you can use this function anywhere in your code like this

web-audio-touch-unlock-usage.js

webAudioTouchUnlock(context).then(function (unlocked)
{
    if(unlocked)
    {
        // AudioContext was unlocked from an explicit user action,
        // sound should start playing now
    }
    else
    {
        // There was no need for unlocking, devices other than iOS
    }
},
function(reason)
{
    console.error(reason);
});

I’ve created an npm package called web-audio-touch-unlock
that exposes this method and makes it easy to use in your own projects.
Just pass your AudioContext instance to it and you’re good to go!

You can try it out yourself here.

Cheers!