Make Alpine 3 support legacy browsers

After The other day, I learned that AlpineJS 3.x uses queueMicrotask — and that that’s an API not supported on Firefox < 69 and Safari < 12.1 (see caniuse for full support information).

Luckily, this can easily be polyfilled:

if (typeof window.queueMicrotask !== "function") { 
    window.queueMicrotask = function (callback) { 
      Promise.resolve() 
        .then(callback) 
        .catch(e => setTimeout(() => { throw e; })); 
    }; 
}

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Originally published at https://wentsch.me.