install gulp

user/themes/anissabensalah/node_modules/rechoir/lib/extension.js

@@ -0,0 +1,11 @@
+const path = require('path');
+
+const EXTRE = /^[.]?[^.]+([.].*)$/;
+
+module.exports = function (input) {
+  var extension = EXTRE.exec(path.basename(input));
+  if (!extension) {
+    return;
+  }
+  return extension[1];
+};