export declare function isString(o: any): o is string;
export declare function isNull(o: any): o is null;
export declare function notNull(o: any): o is null;
export declare function emptyString(o: any): boolean;
export declare function nonEmptyString(o: any): boolean;
export declare function isArray<T>(o: any): o is T[];
export declare function emptyArray(o: any): boolean;
export declare function nonEmptyArray(o: any): boolean;
export declare function isInfinity(o: any): boolean;
export declare function isNumber(o: any): o is number;
export declare function isInteger(o: any): boolean;
export declare function isFunction(o: any): o is Function;
export declare function isObject(o: any): o is object;
export declare function isBoolean(o: any): o is boolean;