My own redux implementation with typescript. Integrated this technology into react app to show how it works in real project.

• createStore(subscribe, unsubscribe, getState, dispatch)
• useSelector
• useDispatch
• reducer
• persist
• logger
• Anti-rerender logic (redux prevState and current state comparison)

Store is created by createStore function. Store is a state keeper. useSelector is used to subscribe on store to see state changes. If required state field is changed, react component where useSelector is called will be re-rendered. You can find all this custom redux logic in myOwnRedux folder.

This is how useSelector logic looks like:

const useSelector = (selector: SelectorCallback) => {
  const [state, setState] = useState<State>({});

  useEffect(() => {
    const selectedState = selector(store.getState());
    setState(selectedState);

    const unsubscribe = store.subscribe((previousState, currentState) => {
      const prevState = selector(previousState);
      const newState = selector(currentState);

      // Anti-Rerender logic
      const stateHasBeenChanged = !isEqual(prevState, newState);

      if (stateHasBeenChanged) {
        setState(newState);
      }
    });

    return () => {
      unsubscribe();
    };
  }, []);

  return state;
};

1. npm install - install all dependencies
2. npm start - start a project

• React
• Typescript