export declare function length(min: number, max: number): (val: any, key: any) => string;
export declare function email(): (val: any, key: any) => any;
export declare function containsIn(values: Array<any>): (val: any, key: any) => any;
export declare function alpha(numeric?: boolean): (val: any, key: any) => any;
export declare function alphaSpace(numeric?: boolean): (val: any, key: any) => any;