import { AnyFunction, Truthy } from '../types/misc.js';
export declare const isNotUndefined: <T>(val: T) => val is Exclude<T, undefined>;
export declare const isNotNull: <T>(val: T) => val is Exclude<T, null>;
export declare const isBoolean: (val: any) => val is boolean;
export declare const isTruthy: <T>(val: T) => val is Truthy<T>;
export declare const isFalsy: <T>(val: T) => val is Exclude<T, Truthy<T>>;
export declare const isFunction: (val: any) => val is AnyFunction;
export declare const isNumber: (val: any) => val is number;
export declare const isString: (val: unknown) => val is string;
export declare const isSymbol: (val: any) => val is symbol;
export declare const isBigInt: (val: any) => val is bigint;
export declare const isObject: (val: any) => val is object;