/**
 * Helper function to validate a field.
 * @param value the value of the field
 * @param required whether the field is required or not
 * @param validation the validation function for the field
 * @returns boolean if true, the field is valid, otherwise it is not
 */
export declare function validateField<T>(
/**
 * The value of the field.
 */
value: any, 
/**
 * Whether the field is required or not.
 */
required: boolean, 
/**
 * A function to validate the value of the field.
 */
validation?: (value?: T) => boolean): boolean;