@blockprotocol/external-api/dist/external-api-embedder-handler.js

Implementation of the Block Protocol external API service specification for blocks and embedding applications

import { ServiceHandler } from "@blockprotocol/core";
/**
 * Creates a handler for the externalApi service for the embedder.
 * Register callbacks in the constructor or afterwards using the 'on' method to
 * react to messages from the block. Call the relevant methods to send messages
 * to the block.
 */
export class ExternalApiEmbedderHandler extends ServiceHandler {
    constructor({ callbacks, element, }) {
        super({
            element,
            callbacks,
            serviceName: "externalApi",
            sourceType: "embedder",
        });
    }
    /**
     * Call the provided function when the named message is received, passing the
     * data/errors object from the message. If the named message expects a
     * response, the callback should provide the expected data/errors object as
     * the return.
     * @param messageName the message name to listen for
     * @param handlerFunction the function to call when the message is received,
     *   with the message data / errors
     */
    on(messageName, handlerFunction) {
        // @todo restore this when module resolution issue resolved
        // @see https://app.asana.com/0/1202542409311090/1202614421149286/f
        // const expectedMessageSource = "block";
        // const messageJsonDefinition = externalApiServiceJson.messages.find(
        //   (message) =>
        //     message.messageName === messageName &&
        //     message.source === expectedMessageSource,
        // );
        // if (!messageJsonDefinition) {
        //   throw new Error(
        //     `No message with name '${messageName}' expected from ${expectedMessageSource}.`,
        //   );
        // }
        this.registerCallback({
            callback: handlerFunction,
            messageName,
        });
    }
    getInitPayload() {
        return {};
    }
}
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