import type { Context } from '../context';
import type { Env, MiddlewareHandler, TypedResponse, ValidationTargets } from '../types';
type ValidationTargetKeysWithBody = "form" | "json";
type ValidationTargetByMethod<M> = M extends "get" | "head" ? Exclude<keyof ValidationTargets, ValidationTargetKeysWithBody> : keyof ValidationTargets;
export type ValidationFunction<InputType, OutputType, E extends Env = {}, P extends string = string> = (value: InputType, c: Context<E, P>) => OutputType | Response | Promise<OutputType> | Promise<Response>;
type ExcludeResponseType<T> = T extends Response & TypedResponse<any> ? never : T;
export declare const validator: <InputType, P extends string, M extends string, U extends ValidationTargetByMethod<M>, OutputType = ValidationTargets[U], OutputTypeExcludeResponseType = ExcludeResponseType<OutputType>, P2 extends string = P, V extends {
    in: {
        [K in U]: K extends "json" ? unknown extends InputType ? OutputTypeExcludeResponseType : InputType : {
            [K2 in keyof OutputTypeExcludeResponseType]: ValidationTargets[K][K2];
        };
    };
    out: {
        [K in U]: OutputTypeExcludeResponseType;
    };
} = {
    in: {
        [K in U]: K extends "json" ? unknown extends InputType ? OutputTypeExcludeResponseType : InputType : {
            [K2 in keyof OutputTypeExcludeResponseType]: ValidationTargets[K][K2];
        };
    };
    out: {
        [K in U]: OutputTypeExcludeResponseType;
    };
}, E extends Env = any>(target: U, validationFunc: ValidationFunction<unknown extends InputType ? ValidationTargets[U] : InputType, OutputType, E, P2>) => MiddlewareHandler<E, P, V>;
export {};