如何实现Java或者TS Reflect的反射功能

class MyClass { 
  value: number = 9; 
 
  fun() { 
    console.log('fun print') 
  } 
} 
 
function TestFun(par: number) { 
  console.log('TestFun print, par:' + par) 
} 
 
let RefClass = new MyClass(); 
Reflect.set(RefClass, "key", "keyvalue"); 
let str: string = Reflect.get(RefClass, "key"); 
console.log(str) 
 
Reflect.set(RefClass, "keyFun", () => { 
  console.log('lan print.') 
}); 
let lanFun: Function = Reflect.get(RefClass, "keyFun"); 
lanFun(); 
 
Reflect.set(RefClass, "keyFun2", TestFun); 
let globeFun: Function = Reflect.get(RefClass, "keyFun2"); 
globeFun(4); 
 
Reflect.set(RefClass, "keyFun3", RefClass.fun); 
let classFun: Function = Reflect.get(RefClass, "keyFun3"); 
classFun();

import(path).then(ns => { 
  let cls: ESObject = new ns.TestDataCls(); 
  let indexName = 'name'; 
  cls[indexName] = "1"; 
})