As far as libraries generally go, Redux is tiny. https://github.com/reactjs/redux/tree/master/src https://github.com/reactjs/redux/tree/master/src The largest

As far as libraries generally go, Redux is tiny. https://github.com/reactjs/redux/tree/master/src https://github.com/reactjs/redux/tree/master/src The largest and most important part is CreateStore, but at 250 lines long (mainly comments), it's shockingly simple when you take a look at it.