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# `useGlobalState`
A React hook that creates a globally shared state.
## Usage
```tsx
const useGlobalValue = createGlobalState<number>(0);
const CompA: FC = () => {
const [value, setValue] = useGlobalValue();
return <button onClick={() => setValue(value + 1)}>+</button>;
};
const CompB: FC = () => {
const [value, setValue] = useGlobalValue();
return <button onClick={() => setValue(value - 1)}>-</button>;
};
const Demo: FC = () => {
const [value] = useGlobalValue();
return (
<div>
<p>{value}</p>
<CompA />
<CompB />
</div>
);
};
```
It also allows initializing the state with a function and using a function in the setState:
```tsx
const useGlobalValue = createGlobalState<number>(() => 0);
const CompA: FC = () => {
const [value, setValue] = useGlobalValue();
return <button onClick={() => setValue(value => value + 1)}>+</button>;
};
const CompB: FC = () => {
const [value, setValue] = useGlobalValue();
return <button onClick={() => setValue(value => value - 1)}>-</button>;
};
const Demo: FC = () => {
const [value] = useGlobalValue();
return (
<div>
<p>{value}</p>
<CompA />
<CompB />
</div>
);
};
```
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