Javascript getter/setter unified API

gistfile1.js

var getOwnPropertyDescriptor = function(obj, property) {
    if (!obj) return;

    if (obj.__lookupGetter__) {
        return {
            get: obj.__lookupGetter__(property),
            set: obj.__lookupSetter__(property)
        };
    } else {
        return Object.getOwnPropertyDescriptor(obj, property);
    }
};

/*
 * Utility function: setDescriptor - override getters and setters of property
 */
var defineProperty = function(obj, property, descriptor) {
    if (!obj) return;

    if (obj.__defineGetter__) {
        descriptor.get && obj.__defineGetter__(property, descriptor.get);
        descriptor.set && obj.__defineSetter__(property, descriptor.set);
    } else {
        Object.defineProperty(obj, property, descriptor);
    }
};