If you have a bunch of complex reducer logic which you want to slowly migrate over to Riduce, there's an easy way to do this!

All you need to do is wrap your old root reducer in a new function with a ternary:

import initialState from './initialState';
import oldRootReducer from './oldRootReducer';
import riduceReducer from './riduceReducer';

const newRootReducer = (state = initialState, action) => action.leaf
  ? riduceReducer(state)
  : oldReducer(state)

Here's why this works:

• An action produced by Riduce always has a leaf property (this is an implementation detail)
• (I'm assuming your normal action creators don't give actions the leaf property)
• Therefore, for our mainReducer:
  • If the leaf property is present, pass it to the riduceReducer, which will know how to handle it
  • If it is not, it's a legacy action, so pass it to the oldReducer
• Return whatever we get back as the next value of state