UpdateExpressions as callees must be parenthesized (#6922)

packages/babel-generator/src/node/parentheses.js

@@ -38,9 +38,13 @@ export function NullableTypeAnnotation(node: Object, parent: Object): boolean {
 export { NullableTypeAnnotation as FunctionTypeAnnotation };
 
 export function UpdateExpression(node: Object, parent: Object): boolean {
-  // (foo++).test()
   return (
-    (t.isMemberExpression(parent) && parent.object === node) ||
+    // (foo++).test(), (foo++)[0]
+    t.isMemberExpression(parent, { object: node }) ||
+    // (foo++)()
+    t.isCallExpression(parent, { callee: node }) ||
+    // new (foo++)()
+    t.isNewExpression(parent, { callee: node }) ||
     isClassExtendsClause(node, parent)
   );
 }

packages/babel-generator/test/fixtures/parentheses/update-expression/actual.js

@@ -0,0 +1,8 @@
+(++a)();
+(a++)();
+
+new (++a)();
+new (a++)();
+
+new (++a);
+new (a++);

packages/babel-generator/test/fixtures/parentheses/update-expression/expected.js

@@ -0,0 +1,6 @@
+(++a)();
+(a++)();
+new (++a)();
+new (a++)();
+new (++a)();
+new (a++)();