Redux reducers converter from arrays to function with conditions

reducerConverter.js

const convertReducers = (reducersObject) => {
  const newReducers = {};
  console.log(reducersObject);

  Object.keys(reducersObject).forEach((reducerName) => {
    const { defaultState, reducers } = reducersObject[reducerName];
    newReducers[reducerName] = (state, action) => {
      if (/^@/.test(action.type)) {
        return state || defaultState || {};
      }
      let i = 0;
      const len = (reducers || []).length;
      for (i; i < len; i += 1) {
        const [TYPE, handler] = reducers[i];
        if (action.type === TYPE) {
          if (!(handler instanceof Function)) {
            console.error(`Reducer function not found for type ${TYPE}`);
            return state || defaultState || {};
          }
          return Object.assign({}, state, handler(state, action));
        }
      }
      return state || defaultState || {};
    };
  });

  return newReducers;
};

const convertedReducers = convertReducers({
  [comDashAppsList.name]: comDashAppsList.default
});

export default combineReducers(convertedReducers);