add some packages

node_modules/babel-plugin-minify-mangle-names/lib/fixup-var-scoping.js

@@ -0,0 +1,50 @@
+"use strict";
+
+// this fixes a bug where converting let to var
+// doesn't change the binding's scope to function scope
+// https://github.com/babel/babel/issues/4818
+module.exports = function (mangler) {
+  mangler.program.traverse({
+    VariableDeclaration(path) {
+      if (path.node.kind !== "var") {
+        return;
+      }
+
+      const fnScope = path.scope.getFunctionParent() || path.scope.getProgramParent();
+      const bindingIds = path.getOuterBindingIdentifierPaths();
+
+      for (const name in bindingIds) {
+        const binding = path.scope.getBinding(name); // var isn't hoisted to fnScope
+
+        if (binding.scope !== fnScope) {
+          const existingBinding = fnScope.bindings[name]; // make sure we are clear that the fnScope doesn't already have
+          // an existing binding
+
+          if (!existingBinding) {
+            // move binding to the function scope
+            // update our scopeTracker first before
+            // we mutate the scope
+            mangler.scopeTracker.moveBinding(binding, fnScope);
+            fnScope.bindings[name] = binding;
+            binding.scope = fnScope;
+            delete binding.scope.bindings[name];
+          } else {
+            // we need a new binding that's valid in both the scopes
+            // binding.scope and fnScope
+            const newName = fnScope.generateUid(binding.scope.generateUid(name)); // rename binding in the original scope
+
+            mangler.rename(binding.scope, binding, name, newName); // move binding to fnScope as newName
+            // update our scopeTracker first before
+            // we mutate the scope
+
+            mangler.scopeTracker.moveBinding(binding, fnScope);
+            fnScope.bindings[newName] = binding;
+            binding.scope = fnScope;
+            delete binding.scope.bindings[newName];
+          }
+        }
+      }
+    }
+
+  });
+};