/**
 * Deep clones an object while removing all undefined values.
 * Preserves methods, getters/setters, non-enumerable properties, symbols, and prototype chains.
 * @param {unknown} obj - The object to clone.
 * @param {WeakMap} seen - Map to track circular references.
 * @returns {unknown} The cloned object without undefined values.
 */
export declare function deepCloneWithoutUndefined<T>(obj: T, seen?: WeakMap<WeakKey, any>): T;
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