Youtube in React: channel reducer reacts to VIDEO_DETAILS_SUCCESS action

channels.js

export default function (state = initialState, action) {
  switch (action.type) {
    case WATCH_DETAILS[SUCCESS]:
      return reduceWatchDetails(action.response, state);
    case VIDEO_DETAILS[SUCCESS]:
      return reduceVideoDetails(action.response, state);
    default:
      return state;
  }
}