Артём Арутюнян (2018-04-25T13:24:41.000Z)
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artalar at ya.ru (2018-04-25T13:29:30.899Z)
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I propose spread assignment operator:
 
var obj = { test1: 1 };
var anotherObj = { test2: 2 };
obj ...= { test2: 2 }; // == (obj = { ...obj, ...anotherObj })
// { test1: 1, test2: 2 }
I'm surprised it wasn't in the original implementation