JavaScript ES6 Module Export - DOM Element Extended Method

When it comes to custom extended element methods such as PlainJS closest() DOM Element method:

// closest polyfill
this.Element && function(ElementPrototype) {
    ElementPrototype.closest = ElementPrototype.closest ||
    function(selector) {
        var el = this;
        while (el.matches && !el.matches(selector)) el = el.parentNode;
        return el.matches ? el : null;
    }
}(Element.prototype);

What would be the safest way to export and import an extension methods such as this with ES6 Module Imports/Exports? Placing export in front of the method definition leads to an "unexpected token this" error. What is the best approach to exporting to including IIFEs with the ES6 module system.

If the goal is to use a method such as .closest() as an Element class method, wrapping in another exportable function doesn't seem right.

Thank you for your time.

Answer:1

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