add some packages

node_modules/babel-helper-remove-or-void/lib/index.js

@@ -0,0 +1,28 @@
+"use strict";
+
+module.exports = function (t) {
+  // If we can't remove the expression we'll just replace it with an empty statement.
+  function removeOrVoid(path) {
+    // If we are working with the expression of an expression statement we want to deal
+    // with the expression statement instead.
+    if (path.parentPath.isExpressionStatement({
+      expression: path.node
+    })) {
+      path = path.parentPath;
+    } // If we are working with a variable declarator and there is only one then
+    // we need to look at the parent.
+
+
+    if (path.isVariableDeclarator() && path.parent.declarations[0] === path.node && path.parent.declarations.length === 1) {
+      path = path.parentPath;
+    }
+
+    if (!path.inList && path.scope.path.type !== "ForStatement") {
+      path.replaceWith(t.emptyStatement());
+    } else {
+      path.remove();
+    }
+  }
+
+  return removeOrVoid;
+};