added unit testing, and started implementing unit tests...phew

node_modules/logform/logstash.js

@@ -0,0 +1,29 @@
+'use strict';
+
+const format = require('./format');
+const { MESSAGE } = require('triple-beam');
+const jsonStringify = require('fast-safe-stringify');
+
+/*
+ * function logstash (info)
+ * Returns a new instance of the LogStash Format that turns a
+ * log `info` object into pure JSON with the appropriate logstash
+ * options. This was previously exposed as { logstash: true }
+ * to transports in `winston < 3.0.0`.
+ */
+module.exports = format(info => {
+  const logstash = {};
+  if (info.message) {
+    logstash['@message'] = info.message;
+    delete info.message;
+  }
+
+  if (info.timestamp) {
+    logstash['@timestamp'] = info.timestamp;
+    delete info.timestamp;
+  }
+
+  logstash['@fields'] = info;
+  info[MESSAGE] = jsonStringify(logstash);
+  return info;
+});