variable changed by other, but I just want to get a clone of it

demo.js

var mo = require('./module')();
console.log(mo);
var who = mo.A;
console.log(who);
who.name ='wal2er';
console.log(who);
console.log(mo);

module-1.js

module.exports = function() {
    return {
        A: { name: 'rammus', gender: 'man' },
        B: { name: 'J', gender: 'woman' }
    };
};

module-2.js

module.exports = {
    A: { name: 'rammus', gender: 'man' },
    B: { name: 'J', gender: 'woman' }
};

result : module-1

{ A: { name: 'rammus', gender: 'man' },
  B: { name: 'J', gender: 'woman' } }
{ name: 'rammus', gender: 'man' }
{ name: 'wal2er', gender: 'man' }
{ A: { name: 'wal2er', gender: 'man' },
  B: { name: 'J', gender: 'woman' } }

result : module-2

{ A: { name: 'rammus', gender: 'man' },
  B: { name: 'J', gender: 'woman' } }
{ name: 'rammus', gender: 'man' }
{ name: 'wal2er', gender: 'man' }
{ A: { name: 'wal2er', gender: 'man' },
  B: { name: 'J', gender: 'woman' } }

Solution 1: use module-1.js

var mo = require('./module');
console.log(mo());
var who = mo().A;