import { AbstractType } from "./AbstractType";
import { Req, scalar } from "@huz-com/types";
import { FunctionTypeOption } from "./index.interfaces";
import { FuncSignature } from "@huz-com/primitive/dist/index.interfaces";
declare type T = scalar.AnyFunc;
declare type O = FunctionTypeOption;
export declare class FunctionType extends AbstractType<T, O> {
    protected static _ins: FunctionType;
    /**
     * Returns skeleton instance
     * */
    static ins(): FunctionType;
    constructor();
    /**
     * Checks is function?
     */
    is(value: scalar.Unknown, opt?: O, req?: Req): boolean;
    /**
     * Converts a value to function
     */
    cast(value: scalar.Unknown, opt?: O, req?: Req): T | null;
    /**
     * Returns name of function
     * */
    getName(fn: scalar.AnyFunc | scalar.Alpha): scalar.Alpha | null;
    /**
     * Returns name of function
     * */
    getFqn(fn: scalar.AnyFunc | scalar.Alpha): scalar.Alpha | null;
    /**
     * Returns signature of function
     * */
    getSignature(fn: scalar.AnyFunc): FuncSignature;
}
export {};