export type BridgeDetails = {
    port: MessagePort;
    initialState?: string;
};
/**
 * Waits for the host app to send the bridge details (port and optional
 * initial state) as part of the handshake.
 *
 * @internal
 *
 * @privateRemarks
 * There might be multiple connections to the host app from the same origin
 * (ie, multiple instances of the same custom app). The handshake ID is used to
 * identify the connection and is used to filter the messages from the host
 * app. Similarly, the messages that are not coming from the host app are
 * ignored.
 *
 * @param handshakeId - the handshake ID to wait for.
 * @param hostAppOrigin - the origin of the host app.
 * @returns the bridge port and optional initial state.
 *
 * @throws an error if the bridge details are not received within the
 *  handshake timeout.
 */
export declare const waitForBridgeDetails: (handshakeId: string, hostAppOrigin: string) => Promise<BridgeDetails>;