hedera-web/js/vn/mutators.js

vnCustomTags = {};

const Mutators = Class.Mutators;
const _Extends = Mutators.Extends;

Mutators.Extends = function() {
	_Extends.apply(this, arguments);
	this.implement({Properties: {}});
}

Mutators.Tag = function(tagName) {
	vnCustomTags[tagName] = this;
	this.extend({Tag: tagName});
	
	const parent = this.parent;
	if (parent && parent.Classes !== undefined) {
		let Classes = tagName
		
		if (parent.Classes !== '')
			Classes += ' '+ parent.Classes;
		this.extend({Classes});
	}
};

Mutators.Properties = function(props) {
	let parentProps;
	
	for (const propName in props) {
		const prop = props[propName];
		prop.configurable = true;
	
		if (!prop.get && !prop.set && prop.writable === undefined)
			prop.writable = true;
	}

	if (this.parent && (parentProps = this.parent.Properties))
	for (const propName in parentProps)
	if (!props[propName])
		props[propName] = parentProps[propName];
		
	this.extend({Properties: props});
	Object.defineProperties(this.prototype, props);
};