/**
 * Performance-optimized deep clone.
 *
 * Optimizations & Security applied:
 * 1. Fast-path for primitives (no cloning needed — they're immutable).
 * 2. WeakMap-based reference tracking — handles circular refs AND
 *    preserves shared-reference structure.
 * 3. Prototype Pollution protection (skips `__proto__` and `constructor`).
 * 4. Prototype Chain Preservation (uses `Object.create(Object.getPrototypeOf(value))`).
 * 5. Native fast paths for Date, Map, Set, RegExp, TypedArrays.
 *
 * Note: Guaranteed to return a completely new reference for all objects.
 *
 * @param value The value to clone
 * @param seen WeakMap used internally for tracking circular references
 * @returns A deep-cloned value
 */
export declare function deepClone<T>(value: T, seen?: WeakMap<any, any>): T;