export declare const isEmail: (email: string) => boolean;
export declare const isUUID: (uuid: string) => boolean;
export declare const isPhoneNumber: (num: string) => boolean;
export declare const isJsonString: (str: string) => boolean;
export declare const isAlpha: (str: string) => boolean;
export declare const isAlphanumeric: (str: string) => boolean;
export declare const isNumeric: (str: string) => boolean;
export declare const isUrl: (str: string) => boolean;
export declare const isDate: (str: string) => boolean;
export declare const isEmptyOrWhitespace: (str: string | null | undefined) => boolean;
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