/**
 * Deep-clones a value preserving cycles. Prefers the native `structuredClone`
 * when available; otherwise falls back to a manual walk that handles Dates,
 * arrays, and plain objects. Functions are returned by reference since they
 * can't be structurally cloned.
 */
export declare function safeClone<T>(obj: T, map?: WeakMap<object, unknown>): T;
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