import { AbstractControl, ValidationErrors } from '@angular/forms';
/**
 * Checks that the number of selected child modifiers is within the allowed
 * range of the group modifier. Returns an error keyed by the group name if the
 * selected amount is invalid.
 */
export declare function groupModifierFormValidator(control: AbstractControl): ValidationErrors | null;
/**
 * Validates a single modifier ensuring its amount is within the configured
 * minimum and maximum. Returns an error keyed by the dish name when the amount
 * is out of range.
 */
export declare function modifierFormValidator(control: AbstractControl): ValidationErrors | null;