import { Awaitable } from '../types';
export type AnyFunc = (...args: any[]) => any;
export type MiddlewareValue<F extends AnyFunc> = Awaited<ReturnType<F>>;
export type MiddlewareResult<F extends AnyFunc> = Promise<MiddlewareValue<F>>;
type StaircaseParams<A extends any[]> = A extends [] ? [] : A extends [...infer Rest, any] ? A | StaircaseParams<Rest> : never;
export type MiddlewareNextArgs<F extends AnyFunc> = StaircaseParams<Parameters<F>> | [];
export type MiddlewareNext<F extends AnyFunc> = (...args: MiddlewareNextArgs<F>) => MiddlewareResult<F>;
export type MiddlewareArgs<F extends AnyFunc> = [
    ...args: Parameters<F>,
    next: MiddlewareNext<F>
];
export type MiddlewareReturn<F extends AnyFunc> = Awaitable<MiddlewareValue<F>>;
export type Middleware<F extends AnyFunc> = (...args: MiddlewareArgs<F>) => MiddlewareReturn<F>;
export type MiddlewareAcceptResult<F extends AnyFunc> = (s: MiddlewareValue<F>) => Awaitable<boolean>;
export type MiddlewareErrorHandler<F extends AnyFunc> = (e: any, args: Parameters<F>, next: MiddlewareNext<F>) => Awaitable<MiddlewareValue<F>>;
export interface MiddlewareDispatcherOptions<F extends AnyFunc> {
    acceptResult?: MiddlewareAcceptResult<F>;
    errorHandler?: MiddlewareErrorHandler<F>;
}
export {};