hermes-io

A lightweight React library that allows communication between components by using the observer pattern and the hook api.

Documentation

See: https://hermes-io-docs.vercel.app/

Usage

import { MicroStore } from "hermes-io";

export const store = new MicroStore();
export const storeId = 'counter-id';

export const actions = {
  INCREMENT: "INCREMENT",
  DECREMENT: "DECREMENT"
};

export default function reducer(store, action) {
  const actionsMap = {
    [actions.INCREMENT]: () => {
      store.state.count += 1;
    },
   [actions.DECREMENT]: () => {
      store.state.count -= 1;
    },
  };
  return actionsMap[action.payload.type]();
};

import { useObservableStore } from "hermes-io";
import { store, storeId } from "@/store";
import reducer, { actions } from "@/reducer";

export default function App() {
  useObservableStore(storeId, { count: 0 }, reducer, store);

  const increment = () => store.mutate({ type: events.INCREMENT });

  const decrement = () => store.mutate({ type: events.DECREMENT });

  return (
    <div>
      <Counter />
      <RenderTracker />
      <button onClick={increment}>Increment</button>
      <button onClick={decrement}>Decrement</button>
    </div>
  );
};

import { useMutations } from "hermes-io";
import { store, storeId } from "@/store";
import { actions } from "@/reducer";

export function Counter() {
  const { state, onEvent } = useMutations({
    initialState: { count: 0 },
    id: storeId,
    store,
  });
  const handleEvent = (value, _resolver, _setNoUpdate, currentState) => ({ count: currentState.count }); 

  onEvent(actions.INCREMENT, handleEvent);
  onEvent(actions.DECREMENT, handleEvent);

  return <h1>Counter: {state.count}</h1>;
}

Devtool

Install from chrome web store here