import { RPCMessage, IInjectTransport, RPCMessageType, ListeningTicket, IRPCRequest, IRPCResponseWrapper } from '@staffbar/types';
export declare class InjectTransport implements IInjectTransport {
    constructor({ targetWindow, targetOrigin }: {
        targetWindow: Window;
        targetOrigin: string;
    });
    private _targetWindow;
    private _targetOrigin;
    /**
     * In order for `window.removeEventListener` to work we need to pass the same
     * exact function that we used for `addListener`. This is a way to cache that
     * value because `.bind(this)` mutates the original `_onRawMessageRecevied`
     *
     * This also implicitly tracks state about if we're listening or not,
     * `undefined` meaning not listening
     *
     */
    private _listeneingRef;
    startListening(): void;
    stopListening(): void;
    private _listeners;
    addListener(responder: (request: IRPCRequest, response: IRPCResponseWrapper) => void): ListeningTicket;
    removeListener(listeningTicket: ListeningTicket): void;
    private _onRawMessageReceived;
    private _onRequestMessageReceived;
    publish(message: RPCMessage, messageType?: RPCMessageType): void;
}
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