/**
 * Object utility functions
 */
/**
 * Pick defined (non-undefined) properties from an object for specified keys.
 * Useful for building options objects where undefined values should be omitted
 * (especially with exactOptionalPropertyTypes).
 *
 * @param obj - Source object
 * @param keys - Keys to pick from the object
 * @returns New object with only defined values for specified keys
 */
export declare function pickDefined<T, K extends keyof T>(obj: T, keys: readonly K[]): {
    [P in K]?: Exclude<T[P], undefined>;
};
/**
 * Deep equality comparison for arbitrary values.
 * Supports primitives, arrays, and plain objects (recursive).
 */
export declare function isEqual(a: unknown, b: unknown): boolean;
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