npm and error messages

node_modules/yargs/lib/assign.js

@@ -0,0 +1,15 @@
+// lazy Object.assign logic that only works for merging
+// two objects; eventually we should replace this with Object.assign.
+module.exports = function assign (defaults, configuration) {
+  var o = {}
+  configuration = configuration || {}
+
+  Object.keys(defaults).forEach(function (k) {
+    o[k] = defaults[k]
+  })
+  Object.keys(configuration).forEach(function (k) {
+    o[k] = configuration[k]
+  })
+
+  return o
+}