/** @module check.ts */
/**
 * Takes value and returns boolean with true signifying type is null, undefined, or NaN.
 * :: a -> bool
 */
export declare const isNullyOrNaN: (a: any) => boolean;
/**
 * Todo
 */
export declare const isNullable: (a: any) => a is null | undefined;
/**
 * Todo
 */
export declare const isNanOrInfinity: (a: any) => boolean;
/**
 * Todo
 */
export declare const isNumber: (a: any) => a is number;
/**
 * Todo
 */
export declare const isObject: (a: any) => a is object;
/**
 * Todo
 */
export declare const isFunction: (a: any) => a is (...a: any[]) => any;
/**
 * Todo
 */
export declare const isArray: (a: any) => a is unknown[];
/**
 * Takes value and returns boolean with true signifying type is not null, undefined, or NaN.
 * :: a -> bool
 */
export declare const isNotNully: (a: any) => boolean;