js multi-inheritance simulation

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const mixinProps = (target, source) => {
Object.getOwnPropertyNames(source).forEach(prop => {
if (/^(?:constructor|isInstanceOf)$/.test(prop)) { return; }
Object.defineProperty(target, prop, Object.getOwnPropertyDescriptor(source, prop));
})
};
const mroMerge = (list) => {
if (!list || !list.length) {
return [];
 
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