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

node_modules/logform/examples/metadata.js

@@ -0,0 +1,78 @@
+const { format } = require('../');
+const { combine, json, metadata, timestamp } = format;
+
+// Default Functionality (no options passed)
+const defaultFormatter = combine(
+  timestamp(),
+  metadata(),
+  json()
+);
+
+const defaultMessage = defaultFormatter.transform({
+  level: 'info',
+  message: 'This should be a message.',
+  application: 'Microsoft Office',
+  store: 'Big Box Store',
+  purchaseAmount: '9.99'
+});
+
+console.dir(defaultMessage);
+
+
+// Fill all keys into metadata except those provided
+const formattedLogger = combine(
+  timestamp(),
+  metadata({ fillExcept: ['message', 'level', 'timestamp'] }),
+  json()
+);
+
+const fillExceptMessage = formattedLogger.transform({
+  level: 'info',
+  message: 'This should have attached metadata',
+  category: 'movies',
+  subCategory: 'action'
+});
+
+console.dir(fillExceptMessage);
+
+
+// Fill only the keys provided into the object, and also give it a different key
+const customMetadataLogger = combine(
+  timestamp(),
+  metadata({ fillWith: ['publisher', 'author', 'book'], key: 'bookInfo' }),
+  json()
+);
+
+const fillWithMessage = customMetadataLogger.transform({
+  level: 'debug',
+  message: 'This message should be outside of the bookInfo object',
+  publisher: 'Lorem Press',
+  author: 'Albert Einstein',
+  book: '4D Chess for Dummies',
+  label: 'myCustomLabel'
+});
+
+console.dir(fillWithMessage);
+
+// Demonstrates Metadata 'chaining' to combine multiple datapoints.
+const chainedMetadata = combine(
+  timestamp(),
+  metadata({ fillWith: ['publisher', 'author', 'book'], key: 'bookInfo' }),
+  metadata({ fillWith: ['purchasePrice', 'purchaseDate', 'transactionId'], key: 'transactionInfo' }),
+  metadata({ fillExcept: ['level', 'message', 'label', 'timestamp'] }),
+  json()
+);
+
+const chainedMessage = chainedMetadata.transform({
+  level: 'debug',
+  message: 'This message should be outside of the bookInfo object',
+  publisher: 'Lorem Press',
+  author: 'Albert Einstein',
+  book: '4D Chess for Dummies',
+  label: 'myCustomLabel',
+  purchasePrice: '9.99',
+  purchaseDate: '2.10.2018',
+  transactionId: '123ABC'
+});
+
+console.dir(chainedMessage);