/**
 * Utility functions for Form Objects
 * PHP parity: Helper functions from SupportFormObjects
 */
/**
 * Get the portion of a string before the first dot
 * PHP parity: Str::before($key, '.')
 *
 * @example
 * beforeFirstDot('form.name') // 'form'
 * beforeFirstDot('name') // 'name'
 */
export declare function beforeFirstDot(key: string): string;
/**
 * Get the portion of a string after the first dot
 * PHP parity: Str::after($key, '.')
 *
 * @example
 * afterFirstDot('form.name') // 'name'
 * afterFirstDot('form.address.city') // 'address.city'
 * afterFirstDot('name') // ''
 */
export declare function afterFirstDot(key: string): string;
/**
 * Get a value from an object using dot notation
 * PHP parity: data_get($target, $key)
 *
 * @example
 * dataGet({ form: { name: 'John' } }, 'form.name') // 'John'
 */
export declare function dataGet(target: any, key: string): any;
/**
 * Set a value on an object using dot notation
 * PHP parity: data_set($target, $key, $value)
 *
 * @example
 * const obj = { form: { name: 'John' } }
 * dataSet(obj, 'form.name', 'Jane')
 * // obj.form.name === 'Jane'
 */
export declare function dataSet(target: any, key: string, value: any): void;
export { ucfirst } from '../../utils/string.js';
/**
 * Check if a value is a plain object
 */
export declare function isPlainObject(value: any): value is Record<string, any>;