import { MutableRefObject } from 'react';
export declare function incrementFocus(inputRefs: React.MutableRefObject<(HTMLInputElement | null)[]>, focus: MutableRefObject<number>, qtyInputs: number): number;
export declare function decrementFocus(inputRefs: React.MutableRefObject<(HTMLInputElement | null)[]>, focus: MutableRefObject<number>): number;
export declare function updateFocus(inputRefs: React.MutableRefObject<(HTMLInputElement | null)[]>, valueLength: number, qtyInputs: number): void;
export declare function addValue(prevState: string, value: string, index: number): string;
export declare function removeValue(prevState: string, index: number): string;