Given this example code from the React docs:
var props = {};
props.foo = x;
props.bar = y;
var component = ;
This helps make your code more succinct - since props is an object, the spread operator takes the properties of the object you pass in and applied them to the component. So the Component will have properties a foo with a value of x and a bar with a value of y.
It would be the same as:
var component = ;
just shorter