import express from 'express';
export declare function parseOptionalFiniteNumber(value: unknown, fieldName: string, res: express.Response, options?: {
    min?: number;
}): number | null | undefined;
export declare function parseOptionalInteger(value: unknown, fieldName: string, res: express.Response, options?: {
    min?: number;
}): number | null | undefined;
export declare function parseRequiredString(value: unknown, fieldName: string, res: express.Response): string | null;