/**
 * Deep merge two objects. Plain objects (prototype `Object.prototype` or
 * `null`) are merged recursively. Arrays, primitives, and any non-plain
 * object (e.g. `Date`, `Map`, `Set`, `RegExp`, class instances) from the
 * source replace the target verbatim — they are leaf values.
 */
export declare function deepMerge(target: unknown, source: unknown): unknown;
/**
 * Structural deep equality. Primitives compared by `Object.is`; arrays compared
 * element-wise; plain objects compared by matching key sets and recursive value
 * equality.
 */
export declare function deepEqual(a: unknown, b: unknown): boolean;
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