counter.ts

console.log('counter loading...');

const counter = {
    no: 0
};

export default counter;

index.ts

import counter1 from './counter';
counter1.no++;
console.log('counter1:' + counter1.no);
console.log('counter2:' + counter2.no);

import counter2 from './counter';
counter2.no++;
console.log('counter1:' + counter1.no);
console.log('counter2:' + counter2.no);

counter loading...
counter1:1
counter2:1
counter1:2
counter2:2