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

node_modules/logform/dist/metadata.js

@@ -0,0 +1,64 @@
+'use strict';
+
+function _defineProperty(obj, key, value) { if (key in obj) { Object.defineProperty(obj, key, { value: value, enumerable: true, configurable: true, writable: true }); } else { obj[key] = value; } return obj; }
+
+var format = require('./format');
+
+function fillExcept(info, fillExceptKeys, metadataKey) {
+  var savedKeys = fillExceptKeys.reduce(function (acc, key) {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+  var metadata = Object.keys(info).reduce(function (acc, key) {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+  Object.assign(info, savedKeys, _defineProperty({}, metadataKey, metadata));
+  return info;
+}
+
+function fillWith(info, fillWithKeys, metadataKey) {
+  info[metadataKey] = fillWithKeys.reduce(function (acc, key) {
+    acc[key] = info[key];
+    delete info[key];
+    return acc;
+  }, {});
+  return info;
+}
+/**
+ * Adds in a "metadata" object to collect extraneous data, similar to the metadata
+ * object in winston 2.x.
+ */
+
+
+module.exports = format(function (info) {
+  var opts = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : {};
+  var metadataKey = 'metadata';
+
+  if (opts.key) {
+    metadataKey = opts.key;
+  }
+
+  var fillExceptKeys = [];
+
+  if (!opts.fillExcept && !opts.fillWith) {
+    fillExceptKeys.push('level');
+    fillExceptKeys.push('message');
+  }
+
+  if (opts.fillExcept) {
+    fillExceptKeys = opts.fillExcept;
+  }
+
+  if (fillExceptKeys.length > 0) {
+    return fillExcept(info, fillExceptKeys, metadataKey);
+  }
+
+  if (opts.fillWith) {
+    return fillWith(info, opts.fillWith, metadataKey);
+  }
+
+  return info;
+});