What is react-store-js?

react-store-js is a state management library for react based on svelte/store but adapted to the philosophy of react.

Instalation

npm i react-store-js

How to use:

to use react-state-js is very simple, just initialize your global state and then import it in your component, to mutate/update the state you can use the different hooks

example: counter.store.ts

import { createWritableStore } from "react-store-js";

export const counter = createWritableStore(0);

on: App.tsx

import { useWritable } from "react-store-js";
import { counter } from "./counter.store";

export default function App() {
  const $counter = useWritable(counter);

  return (
    <div>
      <button onClick={() => $counter.update(($counter) => $counter + 1)}>
        count is {$counter.value}
      </button>
    </div>
  );
}

Note: react-store-js is fully type-safe and typed, and generics can be used

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Methods:

• createWritableStore(initialState, StartStopNotifier?): creates a state that can be fined and read

example:

export const counter = createWritableStore(0);

---

• createReadableStore(initialState, StartStopNotifier?): creates a state that can only be read

example:

export const counter = createReadableStore(0);

---

• getStore(state): gets the state directly, works with read-only states as well as mutable states

example:

export const counter = createWritableStore(0);

const value = getStore(couter); // return 0

---

Hooks:

• useWritable(state): can be used to mutate, update, and read state

example:

// initialize store
const counter = createWritableStore(0);

// use store
const $counter = useWritable(counter);

// mutate the state directly
$counter.set(0);

// update the current state
$counter.update(($counter) => $counter + 1);

// get actual state
$counter.value;

---

• useReadable(state): used to read the read-only state

example:

// initialize store
export const now = createReadableStore(Date.now());

const $now = useReadable(now);

// get actual state
$now.value;

---

• useDerived(state | state[], callback, initialState?): create a state whose value is based on the value of one or more other states

example:

// initialize store
const counter = createWritableStore(0);

const $double = useDerived(counter, ($couter) => $counter * 2, 10);

$double.value;

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• useSubcriber(state, callback): used to listen for changes in state when the state changes

example:

const counter = createWritableStore(0);

const $counter = useWritable(counter);

$counter.update(($counter) => $counter + 1);

useEffect(() => {
  const unsubcribe = useSubcriber(counter, ($counter) => {
    console.log($counter); // 1
  });

  // stop listening when component disconnects
  return unsubcribe;
}, []);

---

Advances examples:

createReadableStore with inside mutation:

on: time.store.ts

export const time = createReadableStore(0, (set) => {
  const a = setInterval(() => set(Date.now()), 1000);

  return () => clearInterval(a);
});

createWritableStore with inside mutation:

on: time.store.ts

export const time = createWritableStore(0, (set) => {
  const a = setInterval(() => set(Date.now()), 1000);

  return () => clearInterval(a);
});