import { NonPrimitive, Nullable } from '../types';
import { Bottom, NonArray } from './types';
export declare const isBlank: <T>(value: T) => value is Nullable<T>;
export declare const isPresent: <T>(value: T) => value is NonNullable<T>;
export declare const isFunction: (value: any) => value is Function;
export declare const isBoolean: (value: any) => value is boolean;
export declare const isString: (value: any) => value is string;
export declare const isNumber: (value: any) => value is number;
export declare const isArray: <T>(value: any) => value is T[];
/**
 *
 * @example
 *
 * ```ts
 * type MyMap = { who: string; age: number }
 * declare const someObj: MyMap | string | number
 *
 * if (isObject(someObj)) {
 *  // $ExpectType MyMap
 *  someObj
 * } else {
 *  // $ExpectType string | number
 *  someObj
 * }
 * ```
 */
export declare const isObject: <T extends {} | null | undefined>(value: T) => value is NonArray<NonPrimitive<NonNullable<T>>>;
export declare const isDate: (value: any) => value is Date;
export declare const isPromise: (value: any) => value is PromiseLike<any>;
/**
 *
 * Checks if string OR array OR object is empty.
 * If you provide another value to check it will throw an error.
 */
export declare const isEmpty: <T extends string | object>(value: "" | never[] | Record<string, never> | T) => value is Bottom<T>;
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