Can we access single javascript object from two nodejs files [closed]

tester.mjs:

var instance = null;
export default class tester {
  constructor() {
   this.name = null;
  }
  static getInstance(){
    if(!instance){
      console.log("Creating instance")
      instance = new tester();
    }
    return instance;
  }
  
  setName(name) {
   this.name = name
  }
  
  getName() {
   return this.name
  }
}

file1.mjs:

import tester from './tester';
var obj = tester.getInstance();
obj.setName("seetha")

file2.mjs:

import tester from './tester';
var obj1 = tester.getInstance();
console.log(obj1.getName())

I am trying to set the name from file1.mjs and get the name from file2.mjs.First I run file1.mjs then it creates one javascript object for tester.mjs.Second I run file2.mjs then it again creating new javascript object for tester.mjs.But I want to use single javascript object of tester in both file1.mjs,file2.mjs and I want to run file1.mjs and file2.mjs independently.
Can anyone suggest me to achieve this.