/**
 * Returns a proxy object that provides access to the methods of the given instance's parent class.
 * The returned proxy object behaves like `super` keyword in that it allows accessing parent class instance methods.
 *
 * @param {object} instance - The instance to get the parent class instance methods from.
 * @param {WeakMap<any,any>|boolean} [cache] - An optional WeakMap object to cache the proxy object for better performance. defaults to false
 * @returns {object} - A proxy object that provides access to the methods of the given instance's parent class.
 * @throws {TypeError} - If the given instance is not an object or is null.
 *
 * @example
 * class Creature {
 *   walk() {
 *     console.log('Creature walks');
 *   }
 * }
 * class Animal extends Creature {
 *   walk() {
 *     console.log('Animal walks');
 *     getSuper(this).walk(); // call the parent's walk method
 *   }
 * }
 *
 * class Rabbit extends Animal {
 *   walk() {
 *     console.log('Rabbit hops');
 *     // super.walk();
 *     getSuper(this).walk(); // call the parent's walk method
 *   }
 * }
 *
 * const rabbit = new Rabbit();
 * const superRabbit = getSuper(rabbit);
 * superRabbit.walk(); // logs 'Animal walks'
 */
export function getSuper(instance: object, cache?: WeakMap<any, any> | boolean): object;
export default getSuper;