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little-state-machine

v4.8.0

Published

State management made super simple

Downloads

1,135,133

Readme

State management made super simple

npm downloads npm npm

  • Tiny with 0 dependency and simple (715B gzip)
  • Persist state by default (sessionStorage or localStorage)
  • Build with React Hooks
$ npm install little-state-machine

🔗 StateMachineProvider

This is a Provider Component to wrapper around your entire app in order to create context.

<StateMachineProvider>
  <App />
</StateMachineProvider>

🔗 createStore

Function to initialize the global store, invoked at your app root (where <StateMachineProvider /> lives).

function log(store) {
  console.log(store);
  return store;
}

createStore(
  {
    yourDetail: { firstName: '', lastName: '' } // it's an object of your state
  },
  {
     name?: string; // rename the store
     middleWares?: [ log ]; // function to invoke each action
     storageType?: Storage; // session/local storage (default to session)
     
     persist?: 'action' // onAction is default if not provided
     // when 'none' is used then state is not persisted
     // when 'action' is used then state is saved to the storage after store action is completed
     // when 'beforeUnload' is used then state is saved to storage before page unloa
  },
);

🔗 useStateMachine

This hook function will return action/actions and state of the app.

const { actions, state, getState } = useStateMachine<T>({
  updateYourDetail,
});

Check out the Demo.

import React from 'react';
import {
  StateMachineProvider,
  createStore,
  useStateMachine,
} from 'little-state-machine';

createStore({
  yourDetail: { name: '' },
});

function updateName(state, payload) {
  return {
    ...state,
    yourDetail: {
      ...state.yourDetail,
      ...payload,
    },
  };
}

function YourComponent() {
  const { actions, state } = useStateMachine({ updateName });

  return (
    <div onClick={() => actions.updateName({ name: 'bill' })}>
      {state.yourDetail.name}
    </div>
  );
}

const App = () => (
  <StateMachineProvider>
    <YourComponent />
  </StateMachineProvider>
);

⌨️ Type Safety (TS)

You can create a global.d.ts file to declare your GlobalState's type.

Checkout the example.

import 'little-state-machine';

declare module 'little-state-machine' {
  interface GlobalState {
    yourDetail: {
      name: string;
    };
  }
}

Quick video tutorial on little state machine.

DevTool component to track your state change and action.

import { DevTool } from 'little-state-machine-devtools';

<StateMachineProvider>
  <DevTool />
</StateMachineProvider>;