Revert #7367 "Fix: remove unnecessary parens when yielding jsx" (#9011)

changelog_unreleased/javascript/pr-9011.md

@@ -0,0 +1,21 @@
+#### Add parens when yielding jsx ([#9011](https://github.com/prettier/prettier/pull/9011) by [@fisker](https://github.com/fisker))
+
+In `v2.0.0` we [removed the parens when yielding jsx](https://prettier.io/blog/2020/03/21/2.0.0.html#remove-unnecessary-parens-when-yielding-jsx-7367httpsgithubcomprettierprettierpull7367-by-cola119httpsgithubcomcola119), this works for most parsers, but ESLint throws when parsing it, [related issue](https://github.com/acornjs/acorn-jsx/issues/82).
+
+<!-- prettier-ignore -->
+```js
+// Input
+function* f() {
+  yield <div>generator</div>
+}
+
+// Prettier stable
+function* f() {
+  yield <div>generator</div>
+}
+
+// Prettier master
+function* f() {
+  yield (<div>generator</div>);
+}
+```

src/language-js/needs-parens.js

@@ -730,8 +730,7 @@ function needsParens(path, options) {
           parent.type !== "ReturnStatement" &&
           parent.type !== "ThrowStatement" &&
           parent.type !== "TypeCastExpression" &&
-          parent.type !== "VariableDeclarator" &&
-          parent.type !== "YieldExpression")
+          parent.type !== "VariableDeclarator")
       );
     case "TypeAnnotation":
       return (

tests/js/yield/__snapshots__/jsfmt.spec.js.snap

@@ -87,8 +87,8 @@ function* f() {
 
 =====================================output=====================================
 function* f() {
-  yield <div>generator</div>;
-  yield <div>generator</div>;
+  yield (<div>generator</div>);
+  yield (<div>generator</div>);
   yield (
     <div>
       <p>generator</p>