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

node_modules/logform/errors.js

@@ -0,0 +1,39 @@
+/* eslint no-undefined: 0 */
+'use strict';
+
+const format = require('./format');
+const { LEVEL, MESSAGE } = require('triple-beam');
+
+/*
+ * function errors (info)
+ * If the `message` property of the `info` object is an instance of `Error`,
+ * replace the `Error` object its own `message` property.
+ *
+ * Optionally, the Error's `stack` property can also be appended to the `info` object.
+ */
+module.exports = format((einfo, { stack }) => {
+  if (einfo instanceof Error) {
+    const info = Object.assign({}, einfo, {
+      level: einfo.level,
+      [LEVEL]: einfo[LEVEL] || einfo.level,
+      message: einfo.message,
+      [MESSAGE]: einfo[MESSAGE] || einfo.message
+    });
+
+    if (stack) info.stack = einfo.stack;
+    return info;
+  }
+
+  if (!(einfo.message instanceof Error)) return einfo;
+
+  // Assign all enumerable properties and the
+  // message property from the error provided.
+  Object.assign(einfo, einfo.message);
+  const err = einfo.message;
+  einfo.message = err.message;
+  einfo[MESSAGE] = err.message;
+
+  // Assign the stack if requested.
+  if (stack) einfo.stack = err.stack;
+  return einfo;
+});