mini-react-dom/src/core/redux.js

A lightweight React-like DOM renderer with JSX, hooks, context, SSR and lazy support

export function createStore(reducer, initialState) {
  let state = initialState;
  const listeners = [];

  const getState = () => state;

  const dispatch = (action) => {
    state = reducer(state, action);
    listeners.forEach((fn) => fn());
  };

  const subscribe = (listener) => {
    listeners.push(listener);
  };

  return { getState, dispatch, subscribe };
}