How to use the defaults.debugLogger function in defaults

this.minLevel                   = opts.minLevel;
		this.replacer                   = opts.replacer;
		this.inactivityTimeout          = opts.inactivityTimeout || defaults.inactivityTimeout;
		this.timestamp                  = opts.timestamp;
		this.withLevel                  = 'withLevel' in opts ? opts.withLevel : true;
		this.withStack                  = opts.withStack;
		this[$secure]                   = secure;
		this[$reconnectInitialDelay]    = opts.reconnectInitialDelay || defaults.reconnectInitialDelay;
		this[$reconnectMaxDelay]        = opts.reconnectMaxDelay || defaults.reconnectMaxDelay;
		this[$reconnectBackoffStrategy] = opts.reconnectBackoffStrategy || defaults.reconnectBackoffStrategy;
		this.debugEnabled               = opts.debug || false;
		if (!this.debugEnabled) {
			//if there is no debug set, empty logger should be used
			this.debugLogger = { log: () => { } };
		} else {
			this.debugLogger = (opts.debugLogger && opts.debugLogger.log) ? opts.debugLogger : defaults.debugLogger;
		}

		this[$reconnect] = reconnect_core(function () {
			var connection;
			if (secure) {
				connection = tls.connect.apply(tls, arguments, () => {
					if (!connection.authorized) {
						this.debugLogger.log("Secure connection -TLS- is not authorized.");
						const errMsg = connection.authorizationError;
						this.emit(new LogentriesError(text.authError(errMsg)));
					} else if (tls && tls.CleartextStream && connection instanceof tls.CleartextStream) {
						this.emit('connect');
					}
				});
			} else {
				connection = net.connect.apply(null, arguments);