JSFiddle - React, Tailwind, and code Playground

HTML

<script>
Object.defineProperty(window, 'someFunction', {
    value: function() { alert('safe'); },
    writable: false,
    enumerable: false,
    configurable: false
});
</script>

<script>
var someFunction = function() { alert('boom!'); }
someFunction(); // safe;
</script>