'use client'
import { useUrlState } from 'state-in-url';

import { countState } from './countState';

function MyComponent() {
  // for use searchParams from server component
  // e.g. export default async function Home({ searchParams }: { searchParams: object }) {
  // const { state, updateState, updateUrl } = useUrlState(countState, searchParams);
  const { state, updateState, updateUrl } = useUrlState(countState);

  // won't let you to accidently mutate state directly, requires TS
  // state.count = 2 // <- error

  return (
    <div>
      <p>Count: {state.count}</p>

      <button onClick={() => updateUrl({ count: state.count + 1 }), { replace: true }}>
        Increment (Update URL)
      </button>

        // same api as React.useState
      <button onClick={() => updateState(currState => ({...currState, count: currState.count + 1 }) )}>
        Increment (Local Only)
      </button>
      <button onClick={() => updateUrl()}>
        Sync changes to url
        // Or don't sync it and just share state
      </button>

      <button onClick={() => updateUrl(state)}>
        Reset
      </button>
    </div>
  )
}

interface UserSettings {
  theme: 'light' | 'dark';
  fontSize: number;
  notifications: boolean;
}

export const userSettings: UserSettings {
  theme: 'light',
  fontSize: 16,
  notifications: true,
}

'use client'
import { useUrlState } from 'state-in-url';

import { userSettings } from './userSettings';

function SettingsComponent() {
  // `state` will infer from UserSettings type!
  const { state, updateUrl } = useUrlState(userSettings);

  const toggleTheme = () => {
    updateUrl(current => ({
      ...current,
      theme: current.theme === 'light' ? 'dark' : 'light',
    }));
  };

  // sync state to url when idle
  const timer = React.useRef(0 as unknown as NodeJS.Timeout);
  React.useEffect(() => {
    clearTimeout(timer.current);
    timer.current = setTimeout(() => {
      // will compare state by content not by reference and fire update only for new values
      updateUrl(state);
    }, 500);

    return () => {
      clearTimeout(timer.current);
    };
  }, [state, updateUrl]);

  return (
    <div>
      <h2>User Settings</h2>
      <p>Theme: {state.theme}</p>
      <p>Font Size: {state.fontSize}px</p>
      <button onClick={toggleTheme}>Toggle Theme</button>
      {/* Other UI elements to update other settings */}
    </div>
  );
}
...

// Other component
function Component() {
  const { state } = useUrlState(defaultSettings);

  return (
    <div>
      <p>Notifications is {state.notifications ? 'On' : 'Off'}</p>
    </div>
  )
}

  const timer = React.useRef(0 as unknown as NodeJS.Timeout);
  React.useEffect(() => {
    clearTimeout(timer.current);
    timer.current = setTimeout(() => {
      // will compare state by content not by reference and fire update only for new values
      updateUrl(state);
    }, 500);

    return () => {
      clearTimeout(timer.current);
    };
  }, [state, updateUrl]);

'use client'
import { useUrlState } from 'state-in-url';

const someObj = {};

function SettingsComponent() {
  const { state, updateUrl, updateState } = useUrlState<object>(someObj);
}