/**
 * Provider interface.
 *
 * A Provider is the low-level communication channel between host and
 * product (e.g. an iframe `postMessage` bridge, a WebSocket, a
 * MessagePort, etc.).
 *
 * The transport layer sits on top of a Provider and adds
 * request/response correlation, subscription multiplexing, and codec
 * negotiation.
 */
/**
 * Describes how to reach the other side.
 *
 * Both `createHostFacade` and `createProductFacade` accept this type and
 * build the appropriate Provider internally.
 */
export type Messaging = {
    type: "window";
    target: Window | Promise<Window>;
} | {
    type: "messagePort";
    port: MessagePort | Promise<MessagePort>;
};
export type Provider = {
    /**
     * Send data to the other side.
     *
     * Accepts both `Uint8Array` (binary codecs) and plain objects
     * (structured clone codec).
     */
    postMessage(message: Uint8Array | unknown): void;
    /**
     * Register a listener for incoming messages.
     *
     * Returns an unsubscribe function.
     */
    subscribe(callback: (message: Uint8Array | unknown) => void): () => void;
    /** Tear down the provider and release resources. */
    dispose(): void;
};
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