export declare type FN = (...args: any[]) => any;
export default FN;
export declare function isFN(object: any): object is FN;
export declare type FNA0<O> = () => O;
export declare function isFNA0<O>(object: any): object is FNA0<O>;
export declare type FNA1<I, O> = (i: I) => O;
export declare function isFNA1<I, O>(object: any): object is FNA1<I, O>;
export declare type FNA2<I1, I2, O> = (i1: I1, i2: I2) => O;
export declare function isFNA2<I1, I2, O>(object: any): object is FNA2<I1, I2, O>;
export declare type FNA3<I1, I2, I3, O> = (i1: I1, i2: I2, i3: I3) => O;
export declare function isFNA3<I1, I2, I3, O>(object: any): object is FNA3<I1, I2, I3, O>;
export declare type FNAN<P extends unknown[], O> = (...args: P) => O;
export declare function isFNAN<P extends unknown[], O>(object: any): object is FNAN<P, O>;
export declare type ARGS<F extends FN> = Parameters<F>;
export declare type ARG1<F extends FN> = ARGS<F>[0];
export declare type ARG2<F extends FN> = ARGS<F>[1];
export declare type ARG3<F extends FN> = ARGS<F>[2];
export declare type RETURN<F extends FN> = ReturnType<F>;
export declare type OR_ARGS<F> = F extends (...args: infer Args) => any ? Args : unknown;
export declare type OR_ARG1<F> = F extends (...args: infer Args) => any ? Args[0] : unknown;
export declare type OR_ARG2<F> = F extends (...args: infer Args) => any ? Args[1] : unknown;
export declare type OR_ARG3<F> = F extends (...args: infer Args) => any ? Args[2] : unknown;
export declare type OR_RETURN<F> = F extends (...args: any[]) => infer Result ? Result : unknown;