type SubscribableChannel = {
    subscribe: () => () => void;
};
/**
 * Subscribes an iframe RPC channel for the lifetime of the calling component.
 * Returns the same channel so callers can keep a stable handle for `call`.
 *
 * Typed structurally so this hook can live in `replo-utils` without importing
 * the channel implementation from `schemas` (which would close a workspace
 * cycle: schemas → replo-utils).
 */
export declare function useIframeRpcChannel<ChannelType extends SubscribableChannel>(channel: ChannelType): ChannelType;
export declare function useIframeRpcChannel<ChannelType extends SubscribableChannel>(channel: ChannelType | null): ChannelType | null;
export {};