/**
 * Recursively sorts the keys of an object and its nested objects alphabetically.
 * This is useful for consistent object serialization and comparison.
 *
 * @template T - The type of the object to sort
 * @param {T} obj - The object whose keys should be sorted
 * @returns {T} A new object with sorted keys
 * @example
 * const obj = { b: 2, a: 1, c: { f: 6, e: 5 } };
 * const sorted = sortObjectKeys(obj);
 * // Result: { a: 1, b: 2, c: { e: 5, f: 6 } }
 */
export declare function sortObjectKeys<T extends Record<string, unknown>>(obj: T): T;
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