import { JsonObject } from "./types";
/**
 * deepMerge
 * Deep merges two objects, with properties from `b` taking precedence over `a`.
 * - Nested objects are merged recursively
 * - Arrays are concatenated (elements from `a` first, then elements from `b`)
 * - null and undefined values from `b` will override values in `a`
 * - Returns a new object (immutable operation)
 */
export declare function deepMerge<A extends JsonObject, B extends JsonObject>(a: A, b: B): A & B;
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