Allow getState in reducer

Here is a demo scene.

const repoFile = (state = {}, {type, payload}) => {
    switch (type) {
        case uiAction.route.type: {
            if (REPO.FILE.REF.path === payload.path) {
                const topState = getStore().getState();
                const basic = getBasics(topState);
                if(basic.defaultBranch===payload.params.ref){
                         return state;
                 }
                return payload.params;
            }
            return state;
        }
        default:
            return state;
    }
};

I don’t get the reason to forbid getState() in reducers. I have read the source code.

function getState(): S {
    if (isDispatching) {
      throw new Error(
        'You may not call store.getState() while the reducer is executing. ' +
          'The reducer has already received the state as an argument. ' +
          'Pass it down from the top reducer instead of reading it from the store.'
      )
    }

    return currentState as S
  }

If I can’t getState . I must to write a lot action to do this.

[markerikson]

No, calling getState in a reducer is not allowed.

Please see the Redux FAQ entry on how to “share state between slices” for suggestions.

[ematipico]

I am afraid a middleware make app slow.

It won’t, don’t worry 😉 Personal experience