Class Method Proxy Javascript

class_method_proxy.js

function traceMethodCalls(obj) {
    const handler = {
        get(target, propKey, receiver) {
            const targetValue = Reflect.get(target, propKey, receiver);
            if (typeof targetValue === 'function') {
                return function (...args) {
                    console.log('CALL', propKey, args);
                    return targetValue.apply(this, args); // (A)
                }
            } else {
                return targetValue;
            }
        }
    };
    return new Proxy(obj, handler);    
}

class Test {
    constructor () {
        this.test = 1
        /**
         * @type Test
         */
        this.deferred = traceMethodCalls(this);
    }

    incrementTest() {
        this.test ++;
        console.log(`incremented to ${this.test}`)
    }
}



const tp = new Test();
console.log(tp.deferred.incrementTest())
// console.log(tp.incrementTest());
console.log(tp.test)