/**
 * Deeply compares two values for structural equality.
 *
 * Supports primitives, arrays, plain objects, Date, RegExp, Map, and Set.
 * Safely handles circular references to prevent infinite recursion.
 *
 * @param a - The first value to compare
 * @param b - The second value to compare
 * @returns {boolean} True if the values are structurally equal, false otherwise.
 */
export declare function deepEqual(a: any, b: any, seen?: WeakMap<object, object>): boolean;