/**
 * Compares previous and current objects, returning only properties that changed.
 * - Properties in prev but not in current: set to undefined
 * - Properties in current but not in prev: included with current value
 * - Properties in both with different values: included with current value
 *
 * @example
 * // prev = {a: 8, b: 0}, current = {b: 5}
 * // result = {b: 5, a: undefined}
 */
export declare function getChangedProperties<T extends Record<string, any>>(prevPassed: T | null | undefined, currentPassed: T | null | undefined): Partial<T>;
export declare function _isEqual(prev: any, next: any): boolean;