Connect Mailchimp and FTP NDJSON file in our serverless environment

class HttpSourceMailchimpListEmailSuscribers {
    async init() {
        // TODO: Create your http credential with mailchimp information:
        // More info at https://yepcode.io/docs/integrations/http/#credential-configuration
        // Official docs: https://mailchimp.com/developer/marketing/api/
        this.httpClient = yepcode.integration.http(
            "your-mailchimp-credential-name"
        );
    }

    async fetch(publish, done) {
        // TODO: Set your query workflow id and your workflow email id.
        // More info at https://mailchimp.com/developer/marketing/api/automation-email-queue/list-automated-email-subscribers/
        const workflowId = "<your-workflow-id>";
        const workflowEmailId = "<your-workflow-email-id>";
        const suscriptions = await this.httpClient.get(
            `/automations/${workflowId}/emails/${workflowEmailId}/queue`
        );
        for (const suscription of suscriptions.queue) {
            await publish(suscription);
        }
        done();
    }

    async close() {}
}

class SftpTargetUploadNdjson {
    async init() {
        // TODO: Create your sftp credential
        // More info at https://yepcode.io/docs/integrations/sftp/#credential-configuration
        this.sftp = await yepcode.integration.sftp("your-sftp-credential-name");

        // Transforms the items into a ndjson format
        this.stringifier = ndjson.stringify();
        // TODO: Customize the remote directory where to load the ndjson file
        this.upload = this.sftp.put(
            this.stringifier,
            "/remoteDirPath/fileName.ndjson"
        );
    }

    async consume(item) {
        this.stringifier.write(item);
    }

    async close() {
        try {
            this.stringifier.end();
        } catch (error) {
            console.error(`Error ending stringifier`, error);
        }
        try {
            await this.upload;
        } catch (error) {
            console.error(`Error ending upload`, error);
        }
        try {
            await this.sftp.end();
        } catch (error) {
            console.error(`Error ending sftp`, error);
        }
    }
}