/**
 * Performs a deep merge of properties from a diff object into a base object.
 * Recursively merges nested objects, but replaces arrays and primitive values directly.
 * Modifies the base object in place.
 *
 * @param base - The target object to merge properties into (modified in place)
 * @param diff - The source object containing properties to merge
 *
 * @example
 * ```typescript
 * const base = { a: 1, nested: { x: 10, y: 20 } };
 * const diff = { b: 2, nested: { y: 25, z: 30 } };
 * mergeObject(base, diff);
 * // base is now: { a: 1, b: 2, nested: { x: 10, y: 25, z: 30 } }
 *
 * // Arrays are replaced, not merged
 * const base2 = { items: [1, 2, 3] };
 * const diff2 = { items: [4, 5] };
 * mergeObject(base2, diff2);
 * // base2 is now: { items: [4, 5] }
 * ```
 */
export default function mergeObject(base: Record<string, any>, diff: Record<string, any>): void;
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