import { BeSureKey } from './validators';
/**
 * Find a validator that matches `key`, run it with the passed `value`, throw on failure
 * @param {Mixed} value the value to check
 * @param {String} key the validator key to check against
 * @param {any} errorType a type that extends Error
 * @param {String | undefined} errorText the text to include if an error is thrown
 * @throws A validator matching the passed key must exist and return true
 */
export declare function beSure(value: any, key: BeSureKey, errorType?: any, errorText?: string): void;
/**
 * Find a validator that matches `key`, run it with the passed `value`, throw on failure
 * Never throw on `null` value
 * @param {Mixed} value the value to check
 * @param {String} key the validator key to check against
 * @param {any} errorType a type that extends Error
 * @param {String | undefined} errorText the text to include if an error is thrown
 * @throws A validator matching the passed key must exist and return true
 */
export declare function beSureAllowNull(value: any, key: BeSureKey, errorType?: any, errorText?: string): void;
export declare function beSureCustom(value: any, customKey: string, errorType?: any, errorText?: string): void;