import type { AnyFunction } from "../FunctionAssertion";
import type { BetweenOptions, HighInclusiveBetweenOptions, InclusiveBetweenOptions, LowInclusiveBetweenOptions } from "../NumberAssertion";
import { Struct } from "./types";
export declare function isStruct<T>(value: T): value is {
    [K in keyof T]: T[K];
} & Struct;
export declare function isKeyOf<T extends object>(target: T, key: unknown): key is keyof T;
export declare function isPromise<T>(value: unknown): value is Promise<T>;
export declare function isAnyFunction<T extends AnyFunction>(func: unknown): func is T;
export declare function isInclusiveOptions(options: BetweenOptions): options is InclusiveBetweenOptions;
export declare function isLowInclusiveOptions(options: BetweenOptions): options is LowInclusiveBetweenOptions;
export declare function isHighInclusiveOptions(options: BetweenOptions): options is HighInclusiveBetweenOptions;