/**
 * Deep merges two objects, with source values taking precedence over target values.
 * Arrays are replaced (not merged), and null/undefined values in source are preserved.
 *
 * @param target - The target object to merge into (defaults/base values)
 * @param source - The source object to merge from (overrides)
 * @returns A new merged object with source values taking precedence
 * @public
 * @example
 * ```ts
 * const defaults = { a: 1, b: { c: 2, d: 3 } };
 * const overrides = { b: { c: 4 } };
 * const merged = deepMerge(defaults, overrides);
 * // Result: { a: 1, b: { c: 4, d: 3 } }
 * ```
 */
export declare const deepMerge: <T extends Record<string, any>>(target: T, source: Partial<T>) => T;
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