import { Predicate } from './types';
/**
 * Asserts that value satisfies given predicate, otherwise throws a given error with provided message
 *
 * @example
 *
 * // if no message provided then description of the predicate will be taken
 * is.assert(is.string)(null) // Error('Assertion failed. Must be a string')
 *
 * // simple types are mapped to predicates so they get the same description
 * is.assert(String)(null) // Error('Assertion failed. Must be a string')
 *
 * is.assert(String)('string') // undefined - everything is fine
 * is.assert(is.not(is.empty), 'Value is required')(''); // Error('Value is required')
 *
 * // custom error class allowed
 * is.assert(String, undefined, CustomErrorClass)(null); // CustomErrorClass('Assertion failed. Must be a string');
 */
export declare function assert(predicate: (Predicate | Function), message?: string, exceptionClass?: {
    new (message: string): any;
}): (value: any, ...extraArgs: any[]) => void;