@wordpress/data/build-module/redux-store/combine-reducers.js

Data module for WordPress.

export function combineReducers(reducers) {
  const keys = Object.keys(reducers);
  return function combinedReducer(state = {}, action) {
    const nextState = {};
    let hasChanged = false;
    for (const key of keys) {
      const reducer = reducers[key];
      const prevStateForKey = state[key];
      const nextStateForKey = reducer(prevStateForKey, action);
      nextState[key] = nextStateForKey;
      hasChanged = hasChanged || nextStateForKey !== prevStateForKey;
    }
    return hasChanged ? nextState : state;
  };
}
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