add some packages

node_modules/normalize-path/index.js

@@ -0,0 +1,19 @@
+/*!
+ * normalize-path <https://github.com/jonschlinkert/normalize-path>
+ *
+ * Copyright (c) 2014-2017, Jon Schlinkert.
+ * Released under the MIT License.
+ */
+
+var removeTrailingSeparator = require('remove-trailing-separator');
+
+module.exports = function normalizePath(str, stripTrailing) {
+  if (typeof str !== 'string') {
+    throw new TypeError('expected a string');
+  }
+  str = str.replace(/[\\\/]+/g, '/');
+  if (stripTrailing !== false) {
+    str = removeTrailingSeparator(str);
+  }
+  return str;
+};