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

node_modules/logform/printf.js

@@ -0,0 +1,26 @@
+'use strict';
+
+const { MESSAGE } = require('triple-beam');
+
+class Printf {
+  constructor(templateFn) {
+    this.template = templateFn;
+  }
+
+  transform(info) {
+    info[MESSAGE] = this.template(info);
+    return info;
+  }
+}
+
+/*
+ * function printf (templateFn)
+ * Returns a new instance of the printf Format that creates an
+ * intermediate prototype to store the template string-based formatter
+ * function.
+ */
+module.exports = opts => new Printf(opts);
+
+module.exports.Printf
+  = module.exports.Format
+  = Printf;