interceptObjectProperties.js

function interceptObjectProperties(obj, options){
    if (!options) options = {};
    if (!options.ignore) options.ignore = {};

    for (var i in obj) {
        const prop = i;
        if (!obj.hasOwnProperty(prop)) continue;
        if (options.ignore[prop]) continue;
        var descriptor = Object.getOwnPropertyDescriptor(obj, prop);
        if (descriptor.set) {
            const original = descriptor.set;
            descriptor.set = function(value){
                console.log('set', prop, value)
                return original.call(this, value)
            }
            options.log_interceptable && console.log('intercepted setter '+prop);
        }
        if (descriptor.get) {
            const original = descriptor.get;
            descriptor.get = function(){
                var ret = original.apply(this, arguments)
                console.log('get', prop, ret)
                return ret;
            }
            options.log_interceptable && console.log('intercepted getter '+prop)
        }
        if (descriptor.value) {
            if (typeof descriptor.value === 'function') {
                const original = descriptor.value;
                descriptor.value = function(){
                    console.log('method ', prop, arguments)
                    return original.apply(this, arguments);
                }
                options.log_interceptable && console.log('intercepted function '+prop)
            }
        }
        Object.defineProperty(obj, prop, descriptor);
    }

}