import { RefObject } from "react";
import { ExternalApiBlockHandler, ExternalApiEmbedderHandler } from "./index.js";
/**
 * Create a ExternalApiBlockHandler instance, using a reference to an element in the block.
 *
 * The externalApiService will only be reconstructed if the element reference changes.
 * Updates to any callbacks after first constructing should be made by calling externalApiService.on("messageName", callback);
 */
export declare const useExternalApiBlockService: (ref: RefObject<HTMLElement>, constructorArgs?: Omit<ConstructorParameters<typeof ExternalApiBlockHandler>[0], "element">) => {
    externalApiService: ExternalApiBlockHandler;
};
/**
 * Create a ExternalApiBlockHandler instance, using a reference to an element in the block.
 *
 * The externalApiService will only be reconstructed if the element reference changes.
 * Updates to any callbacks after first constructing should be made by:
 * 1. to register one, call externalApiService.on("messageName", callback);
 * 2. to register multiple, call externalApiService.registerCallbacks({ [messageName]: callback });
 */
export declare const useExternalApiEmbedderService: (ref: RefObject<HTMLElement>, constructorArgs?: Omit<ConstructorParameters<typeof ExternalApiEmbedderHandler>[0], "element">) => {
    externalApiService: ExternalApiEmbedderHandler;
};