export declare class EnsureError extends Error {
    constructor(message: string);
}
export declare const ensure: {
    string: (name: string, x: string) => string;
    number: (name: string, x: number) => number;
    boolean: (name: string, x: boolean) => boolean;
    array: (name: string, x: any[]) => any[];
    object: (name: string, x: {}) => {};
};