React state management for AI agents

Kiss helps AI agents stay on track, session after session, while spending fewer tokens.

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npm install kiss-for-react

Complete docs → https://kissforreact.org

Linter → eslint-plugin-kiss-for-react

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Overview

Store and state

The store holds all application state. Here are a few examples:

// Your state is a number
const store = createStore<number>({initialState: 1});

// Your state is a plain JavaScript object
const store = createStore({initialState: {name: 'Mary', age: 25}});

// Your state is an instance of an ES6 class
class State { constructor(public name: string, public age: number){} }
const store = createStore<State>({initialState: new State('Mary', 25)});

Use a StoreProvider to add the store to your component tree:

function App() {
  return (
    <StoreProvider store={store}>
      <AppContent />
    </StoreProvider>
  );
};

 

Components use the state

The useAllState hook lets you access the whole state from any component. The component re-renders when any part of the state changes (not recommended, but good for fast prototyping).

function MyComponent() { 
  const state = useAllState<State>();   
  
  return <div>{state.name} is {state.age} years old</div>;    
};

The useSelect hook selects only the part of the state that your component needs. The component re-renders only when that part changes.

function MyComponent() { 
  const name = useSelect((state: State) => state.name);   
  const age = useSelect((state: State) => state.age);
     
  return <div>{name} is {age} years old</div>;    
};

The useObject hook also causes the component to re-render only when needed:

function MyComponent() {
 
  const state = useObject((state: State) => ({
    name: state.name,
    age: state.age,
  }));
       
  return <div>{state.name} is {state.age} years old</div>;    
};

These hooks connect to the store with React's own useSyncExternalStore, so React reads the state itself, compares what each component selected, and renders only the components whose selection changed. React also checks the state again before committing a render it paused (a transition), and renders again if the state changed meanwhile, so a screen never shows parts of two different states at the same time.

 

Actions and reducers

An action is a class with its own reducer function. This reducer has access to the current state and returns a new state.

class Increment extends Action {

  reduce() { 
    // The reducer has access to the current state
    return this.state + 1; // It returns a new state 
  };
}

 

Dispatch an action

The store's state is immutable.

The only way to change the store's state is by dispatching an action, wich runs the action's reducer to get a new state. The new state replaces the current one, and affected components re-render.

// Dispatch an action
store.dispatch(new Increment());

// Dispatch multiple actions
store.dispatchAll([new Increment(), new LoadText()]);

// Dispatch an action and wait for it to finish
await store.dispatchAndWait(new Increment());

// Dispatch multiple actions and wait for them to finish
await store.dispatchAndWaitAll([new Increment(), new LoadText()]);

// Dispatch an action when the state meets a condition
store.dispatchWhen(new LoadText(), (state) => state.count >= 3);

 

Components can dispatch actions

Hooks for dispatching actions include useDispatch, useDispatchAll, useDispatchWhen, etc.

function MyComponent() { 
  const dispatch = useDispatch();  

  return (
    <Button onClick={() => dispatch(new LoadText())}> 
      Click me! 
    </Button>
  );
};

You can also get the store with useStore and dispatch actions directly:

function MyComponent() { 
  const store = useStore();  

  return (
    <Button onClick={() => store.dispatch(new LoadText())}> 
      Click me! 
    </Button>
  );
};

To dispatch actions when the component mounts, when some values change, and when it unmounts, use useStoreEffect instead of a useEffect:

useStoreEffect({
  deps: userId, // List the dependencies
  
  // Loads information needed for this screen
  onMount: (store) => store.dispatch(new LoadUser(userId)),
  
  // When the userId changes, stop listening to the old user and load the new one
  onDepsChange: (store, oldUserId) => {
    store.dispatch(new StopListening(oldUserId));
    store.dispatch(new LoadUser(userId));
  },
  
  // When the component unmounts, clean up any resources used by this screen
  onUnmount: (store) => store.dispatch(new CleanResources()),
});

To reload the data on screen when the user comes back to the browser tab, or when the internet comes back, add onFocus and onOnline (there are also onBlur and onOffline). They run only on the transitions, while the component is mounted, never on mount. Give the action a fresh period to skip the reload when the data is recent:

useStoreEffect({
  onMount: (store) => store.dispatch(new LoadPrices()),
  onFocus: (store) => store.dispatch(new LoadPrices()),
  onOnline: (store) => store.dispatch(new LoadPrices()),
});

Also available in components with useIsFocused() and useIsOnline(), for an "offline" banner.

 

Actions can do asynchronous work

Actions can fetch data from the internet or do any other async work.

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