/**
 * Track a property descriptor on an object and reflect changes to a target object.
 * Can be used to bind Hybrids properties to Alpine data or any other object.
 * Especially useful for binding data to a reactive target to trigger side effects.
 *
 * @param obj the source object
 * @param key a key on the source object
 * @param target a target to reflect the changes
 * @param options options for the property descriptor
 *   - immutable: if true, the target will be updated immutably
 *   - configurable: if true, the property descriptor will be configurable
 *   - enumerable: if true, the property descriptor will be enumerable
 * @returns an updated target object
 */
export declare function trackPropertyDescriptor<E extends object = object>(obj: E, key: keyof E, target: object, options?: {
    immutable?: boolean;
    configurable?: boolean;
    enumerable?: boolean;
}): object;
export declare function deepMerge(target: any, source: any): any;