declare function isNull(value: any): value is null;
declare function isUndefined(value: any): value is undefined;
declare function isDefined(value: any): boolean;
declare function isNil(value: any): value is null | undefined;
declare function isNilOrEmpty(value: any): boolean;
declare function isString(value: any): value is string;
declare function isNumber(value: any): value is number;
declare function isArray<T>(value: any): value is Array<T>;
declare function isEmptyArray(value: any): boolean;
declare function isFunction(value: any): value is (...args: any) => any;
declare function isObject(value: any): value is Record<string, unknown>;
declare function isPlainObject(value: any): value is Record<string, any>;
declare function isPromise(value: any): boolean;

export { isArray, isDefined, isEmptyArray, isFunction, isNil, isNilOrEmpty, isNull, isNumber, isObject, isPlainObject, isPromise, isString, isUndefined };