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let a = {a:1}, b = {b:2};

let target = {};

// skips non-enumerable properties
Object.defineProperty(b, 'c', {
  value: 3,
  enumerable: false
});

Object.assign(target, a, b);

console.log( b );
// {b: 2, c: 3}
console.log( target );
// {a: 1, b: 2}