Add missing parentheses for decorator (#14393)

changelog_unreleased/javascript/14393.md

@@ -0,0 +1,22 @@
+#### Add missing parentheses for decorator (#14393 by @fisker)
+
+<!-- prettier-ignore -->
+```jsx
+// Input
+class Person {
+  @(myDecoratorArray[0])
+  greet() {}
+}
+
+// Prettier stable
+class Person {
+  @myDecoratorArray[0]
+  greet() {}
+}
+
+// Prettier main
+class Person {
+  @(myDecoratorArray[0])
+  greet() {}
+}
+```