/**
 * Helper like assert but work on web and nodejs
 * @param assertion
 * @param message
 */
export declare const required: (assertion: any, message: any) => void;
/**
 * Requires variable to be defined
 * @param variable
 * @param message
 */
export declare const requiredDefined: (variable: any, message: any) => void;
/**
 * Required type of variable
 * @param variable
 * @param {string} type
 * @param message
 */
export declare const requiredType: (variable: any, type: string, message: any) => void;