Fix reused nodes - part 1 (#7149)

packages/babel-plugin-transform-classes/src/index.js

@@ -34,7 +34,7 @@ export default function(api, options) {
         path.replaceWith(node.declaration);
         path.insertAfter(
           t.exportNamedDeclaration(null, [
-            t.exportSpecifier(ref, t.identifier("default")),
+            t.exportSpecifier(t.cloneNode(ref), t.identifier("default")),
           ]),
         );
       },

packages/babel-plugin-transform-classes/src/loose.js

@@ -34,7 +34,7 @@ export default class LooseClassTransformer extends VanillaTransformer {
         classRef = this._protoAlias;
       }
       const methodName = t.memberExpression(
-        classRef,
+        t.cloneNode(classRef),
         node.key,
         node.computed || t.isLiteral(node.key),
       );

packages/babel-plugin-transform-classes/src/vanilla.js

@@ -387,12 +387,12 @@ export default class ClassTransformer {
         // special case single arguments spread
         bareSuperNode.arguments[1] = bareSuperNode.arguments[1].argument;
         bareSuperNode.callee = t.memberExpression(
-          superRef,
+          t.cloneNode(superRef),
           t.identifier("apply"),
         );
       } else {
         bareSuperNode.callee = t.memberExpression(
-          superRef,
+          t.cloneNode(superRef),
           t.identifier("call"),
         );
       }
@@ -456,7 +456,7 @@ export default class ClassTransformer {
     const superRef = this.superName || t.identifier("Function");
     let thisRef = function() {
       const ref = path.scope.generateDeclaredUidIdentifier("this");
-      thisRef = () => ref;
+      thisRef = () => t.cloneNode(ref);
       return ref;
     };