/// <reference types="chrome" />
import { ActionKey } from './keys';
export type Resolved<U = Record<string, unknown>> = {
    [ActionKey]: string;
} & U;
export type RoutingTargetEvent = chrome.events.Event<(...args: any[]) => any> | chrome.webRequest.WebRequestEvent<(...args: any[]) => any, string[]>;
export type ExtractCallback<T> = T extends chrome.events.Event<infer U> ? U : T extends chrome.webRequest.WebRequestEvent<infer V, string[]> ? V : never;
export type HandlerOf<Callback extends (...args: any[]) => any> = (...args: Parameters<Callback>) => (Promise<any | undefined> | undefined);
export type Resolver<Callback extends (...args: any[]) => any, U = Record<string, unknown>> = (...args: Parameters<Callback>) => (Resolved<U> | Promise<Resolved<U>>);
export declare const DefaultResolver: <U = any>(...args: any[]) => Resolved<U>;
export declare class Router<T extends RoutingTargetEvent, U = Record<string, unknown>> {
    readonly resolver: Resolver<ExtractCallback<T>, U>;
    constructor(resolver?: Resolver<ExtractCallback<T>, U>);
    private notfound;
    onNotFound(callback: HandlerOf<ExtractCallback<T>>): void;
    private error;
    onError(callback: HandlerOf<ExtractCallback<T>>): void;
    private readonly routes;
    on(action: string, callback: HandlerOf<ExtractCallback<T>>): unknown;
    private findHandler;
    listener(): ExtractCallback<T>;
    private sendResponse;
}