export declare const isEmpty: (value: unknown) => value is null | undefined;
export declare const isNotEmpty: <T>(value: T | null | undefined) => value is T;
export declare const isNumber: (value: unknown) => value is number;
export declare const isInt: (value: unknown) => value is number;
export declare const isStr: (value: unknown) => value is string;
export declare const isAnObj: <T extends {}>(value: unknown) => value is T;
export declare const isATuple: <T extends any[]>(value: unknown) => value is T;
export declare const isBool: (value: unknown) => value is boolean;