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

node_modules/logform/format.js

@@ -0,0 +1,52 @@
+'use strict';
+
+/*
+ * Displays a helpful message and the source of
+ * the format when it is invalid.
+ */
+class InvalidFormatError extends Error {
+  constructor(formatFn) {
+    super(`Format functions must be synchronous taking a two arguments: (info, opts)
+Found: ${formatFn.toString().split('\n')[0]}\n`);
+
+    Error.captureStackTrace(this, InvalidFormatError);
+  }
+}
+
+/*
+ * function format (formatFn)
+ * Returns a create function for the `formatFn`.
+ */
+module.exports = formatFn => {
+  if (formatFn.length > 2) {
+    throw new InvalidFormatError(formatFn);
+  }
+
+  /*
+   * function Format (options)
+   * Base prototype which calls a `_format`
+   * function and pushes the result.
+   */
+  function Format(options = {}) {
+    this.options = options;
+  }
+
+  Format.prototype.transform = formatFn;
+
+  //
+  // Create a function which returns new instances of
+  // FormatWrap for simple syntax like:
+  //
+  // require('winston').formats.json();
+  //
+  function createFormatWrap(opts) {
+    return new Format(opts);
+  }
+
+  //
+  // Expose the FormatWrap through the create function
+  // for testability.
+  //
+  createFormatWrap.Format = Format;
+  return createFormatWrap;
+};