Connect Get Slack messages and FTP NDJSON file in our serverless environment

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

    async fetch(publish, done) {
        // TODO: Customize your channel id
        const result = await this.slack.client.conversations.history({
            channel: "your-slack-channel-id",
        });

        for (const message of result.messages) {
            await publish(message);
        }
        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);
        }
    }
}