Reduce the set of matched nodes to the first in the set, just like .at(0).
ReactWrapper: A new wrapper that wraps the first node in the set.
const wrapper = mount(<MyComponent />);
expect(wrapper.find(Foo).first().props().foo).to.equal('bar');
.at(index) => ReactWrapper - retrieve any wrapper node.last() => ReactWrapper
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https://airbnb.io/enzyme/docs/api/ReactWrapper/first.html