swiftui-react-native/src/hooks/useBinding.ts

A React Native component library inspired by SwiftUI

import { SetStateAction, useState } from 'react';
import { Binding, BooleanBinding } from '../utils/binding';

/**
 * Creates a Binding object that can be used to read and write to a value.
 * Components can recieve a binding as a prop and can handle the logic of
 * getting and setting the value from inside the component.
 * @param initialValue
 * @returns A Binding containing the value and a setter function.
 */
export function useBinding<T>(initialValue: T) {
  const [value, setValue] = useState<T>(initialValue);
  const toggle = () => setValue(!value as unknown as SetStateAction<T>);

  return {
    value,
    setValue,
    ...(typeof initialValue === 'boolean' && { toggle }),
  } as unknown as T extends boolean ? BooleanBinding : Binding<T>;
}