export declare const isLegalEmail: (email: string) => boolean;
export declare const isIllegalEmail: (email: string) => boolean;
export declare const isLegalPhone: (phone: string) => boolean;
export declare const isIllegalPhone: (phone: string) => boolean;
export declare const isLegalUrl: (url: string) => boolean;
export declare const isIllegalUrl: (url: string) => boolean;
export declare const isInInterval: (source: number, interval: [number, number]) => boolean;
export declare const isImage: (src: string) => boolean;