react-eventsync

eventsync

React-compatible global state management via DOM event streams. No context, no prop-drilling, no re-render headaches.

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Homepage: https://lutif.github.io/eventSync/

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Features

• Global state shared across your React app, powered by DOM CustomEvents
• No React Context: avoids unnecessary re-renders
• Subscribe to any state path: use dot-paths like user.name
• Multiple fields per component: subscribe to as many as you want
• Immutable updates: never mutates your state
• Tiny bundle: no dependencies except React

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Installation

npm install eventsync

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Usage

import { useGlobalState, setGlobalState, initGlobalState } from 'eventsync';

// (Optional) Initialize global state at app startup
initGlobalState({
  user: { name: 'Alice' },
  counter: 0
});

// --- Single value subscription ---
const [counter, setCounter] = useGlobalState('counter');
console.log(counter); // 0
setCounter(1);

// --- Multiple values subscription ---
const [{ user_name, counter: c }, { setUser_name, setCounter }] = useGlobalState([
  'user.name',
  'counter'
]);
console.log(user_name, c);
setUser_name('Bob');
setCounter(2);

// Or programmatically update global state anywhere
setGlobalState('user.name', 'Charlie');

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API

useGlobalState(paths: string[])

• paths: Array of dot-path strings (e.g., ['user.name', 'counter'])
• Returns [values, setters]:
  • values: Object with state pieces, keys auto-prefixed (e.g., user_name)
  • setters: Object with setter functions (e.g., setUser_name)

setGlobalState(path: string, value: any)

• Updates global state at the given path
• Notifies all subscribed components to update if their state has changed

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How It Works

• Global state is held in memory
• Updates are broadcast via DOM CustomEvents
• Components only re-render when their subscribed state changes (shallow equality)
• Dot-path access for deep state
• No state collisions: returned keys are auto-prefixed (e.g., user.name → user_name)

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Example

import { useGlobalState } from 'eventsync';

function Profile() {
  const [{ user_name }, { setUser_name }] = useGlobalState(['user.name']);
  return (
    <div>
      <span>{user_name}</span>
      <button onClick={() => setUser_name('Charlie')}>Change Name</button>
    </div>
  );
}

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Advanced

• Deep nested state: subscribe to any depth (e.g., settings.theme.color)
• Multiple fields: subscribe to as many as you want per component
• Programmatic updates: use setGlobalState anywhere
• SSR-compatible import: You can safely import and use eventsync in server-side rendering (SSR) code, but global state features (state updates, subscriptions) only work in the browser after hydration. No DOM or window access occurs during SSR.

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License

MIT