import { ConnectMessage } from './types';
export declare function connect(currentGlobal: typeof globalThis, onConnect: (channel: Channel, message: ConnectMessage, messageQueue: unknown[]) => void): void;
export declare class Channel {
    private _messageHandlers;
    private _responseHandlers;
    private _send;
    constructor(sourceId: string, currentGlobal: typeof globalThis);
    call<T = unknown>(method: string, ...params: any[]): Promise<T>;
    send(method: string, ...params: any[]): void;
    addHandler<T extends unknown[]>(method: string, handler: (...args: T) => void): () => boolean;
    private _handleMessage;
}
export declare function sendInitMessage(currentGlobal: typeof globalThis): number;