mfExtend.js
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mfExtend.js
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	/**
	* Extends a class with new methods and member properties.
	*
	* @ignore
	* @param {Function} Child function
	* @param {Object\|Function} ParentOrPrototype class to inherit from
	* OR if no inheriting class a prototype to extend the class with
	* @param {Object} [prototype]
	*/
	module.exports = function mfExtend( Child, ParentOrPrototype, prototype ) {
	let key;
	if ( prototype ) {
	OO.inheritClass( Child, ParentOrPrototype );
	} else {
	OO.initClass( Child );
	prototype = ParentOrPrototype;
	}
	for ( key in prototype ) {
	Child.prototype[key] = prototype[key];
	}
	};