import EventEmitter from "eventemitter3";
import { ChannelRpcMethod, EngineEvent, EngineEventMap, IVectorEngine, EngineParams } from "@connext/vector-types";
export declare function isEventName(event: string): event is EngineEvent;
export declare function isMethodName(event: string): event is ChannelRpcMethod;
export interface IframeOptions {
    id: string;
    src: string;
}
export declare function renderElement(name: string, attr: any, target: HTMLElement): HTMLElement;
export interface IRpcChannelProvider {
    connected: boolean;
    send(payload: EngineParams.RpcRequest): Promise<any>;
    open(): Promise<void>;
    close(): Promise<void>;
    on<T extends EngineEvent>(event: T, callback: (payload: EngineEventMap[T]) => void | Promise<void>, filter?: (payload: EngineEventMap[T]) => boolean): void;
    once<T extends EngineEvent>(event: T, callback: (payload: EngineEventMap[T]) => void | Promise<void>, filter?: (payload: EngineEventMap[T]) => boolean): void;
}
export declare class IframeChannelProvider extends EventEmitter<string> implements IRpcChannelProvider {
    private readonly opts;
    iframe: HTMLIFrameElement | undefined;
    connected: boolean;
    private subscribed;
    private events;
    private constructor();
    static connect(opts: IframeOptions): Promise<IframeChannelProvider>;
    open(): Promise<void>;
    close(): Promise<void>;
    send(rpc: EngineParams.RpcRequest): Promise<any>;
    on(event: string | ChannelRpcMethod | EngineEvent, listener: (...args: any[]) => void): any;
    once(event: string | ChannelRpcMethod | EngineEvent, listener: (...args: any[]) => void): any;
    removeAllListeners: () => any;
    exists(): boolean;
    render(): Promise<void>;
    unrender(): Promise<void>;
    handleIncomingMessages(e: MessageEvent): void;
    subscribe(): void;
    unsubscribe(): void;
    private onConnect;
    private onDisconnect;
}
export declare class DirectProvider implements IRpcChannelProvider {
    private readonly engine;
    connected: boolean;
    constructor(engine: IVectorEngine);
    send(payload: EngineParams.RpcRequest): Promise<any>;
    open(): Promise<void>;
    close(): Promise<void>;
    on<T extends EngineEvent>(event: T, callback: (payload: EngineEventMap[T]) => void | Promise<void>, filter?: (payload: EngineEventMap[T]) => boolean): void;
    once<T extends EngineEvent>(event: T, callback: (payload: EngineEventMap[T]) => void | Promise<void>, filter?: (payload: EngineEventMap[T]) => boolean): void;
}
//# sourceMappingURL=channelProvider.d.ts.map