How to use the kafkajs.logLevel.ERROR function in kafkajs

this.serviceLogger = () => ({ namespace, level, log }) => {
            switch(level) {
                case logLevel.ERROR:
                case logLevel.NOTHING:
                    return this.logger.error("KAFKAJS: " + namespace + log.message, log);
                case logLevel.WARN:
                    return this.logger.warn("KAFKAJS: " + namespace + log.message, log);
                case logLevel.INFO:
                    return this.logger.info("KAFKAJS: " + namespace + log.message, log);
                case logLevel.DEBUG:
                    return this.logger.debug("KAFKAJS: " + namespace + log.message, log);
            }
        };

this.serviceLogger = () => ({ level, log }) => {
            switch(level) {
                case logLevel.ERROR:
                case logLevel.NOTHING:
                    return this.logger.error("namespace:" + log.message, log);
                case logLevel.WARN:
                    return this.logger.warn("namespace:" + log.message, log);
                case logLevel.INFO:
                    return this.logger.info("namespace:" + log.message, log);
                case logLevel.DEBUG:
                    return this.logger.debug("namespace:" + log.message, log);
            }
        };

beforeEach(async () => {
    topic = `test-topic-${uuid()}`;
    kafka = new KafkaAvro({
      clientId: `test-client-${uuid()}`,
      brokers: ["localhost:9092"],
      avro: {
        url: "http://localhost:8081"
      },
      logLevel: logLevel.ERROR
    });

    const admin = kafka.admin();
    await admin.connect();
    await admin.createTopics({
      waitForLeaders: true,
      topics: [{ topic }]
    });
    await admin.disconnect();

    producer = kafka.avro.producer();
    await producer.connect();

    const groupId = `test-group-${uuid()}`;
    consumer = kafka.avro.consumer({
      groupId,

this.serviceLogger = kafkalogLevel => ({ namespace, level, label, log }) => {
            switch(level) {
              case logLevel.ERROR:
              case logLevel.NOTHING:
                return this.logger.error("KAFKAJS: " + namespace + log.message, log);
              case logLevel.WARN:
                return this.logger.warn("KAFKAJS: " + namespace + log.message, log);
              case logLevel.INFO:
                return this.logger.info("KAFKAJS: " + namespace + log.message, log);
              case logLevel.DEBUG:
                return this.logger.debug("KAFKAJS: " + namespace + log.message, log);
            }
        }

this.serviceLogger = () => ({ level, log }) => {
            switch(level) {
                case logLevel.ERROR:
                case logLevel.NOTHING:
                    return this.logger.error("namespace:" + log.message, log);
                case logLevel.WARN:
                    return this.logger.warn("namespace:" + log.message, log);
                case logLevel.INFO:
                    return this.logger.info("namespace:" + log.message, log);
                case logLevel.DEBUG:
                    return this.logger.debug("namespace:" + log.message, log);
            }
        };