Ensure parens on NewExpression with function callee (#282)

src/fast-path.js

@@ -378,6 +378,9 @@ FPp.needsParens = function(assumeExpressionContext) {
         case "UnaryExpression":
           return true;
 
+        case "NewExpression":
+          return name === "callee";
+
         default:
           return isBinary(parent);
       }

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

@@ -32,6 +32,7 @@ typeof (() => {});
 export default (() => {})();
 (() => {})()\`\`;
 (() => {})\`\`;
+new (() => {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (a => {
 }).length;
@@ -43,6 +44,8 @@ export default (() => {
 })()\`\`;
 (() => {
 })\`\`;
+new (() => {
+})();
 "
 `;
 

tests/arrows/arrow_function_expression.js

@@ -3,3 +3,4 @@ typeof (() => {});
 export default (() => {})();
 (() => {})()``;
 (() => {})``;
+new (() => {});

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

@@ -192,8 +192,8 @@ var e = async function() {
 var et = async function<T>(a: T) {
 };
 
-var n = new async function() {
-}();
+var n = new (async function() {
+})();
 
 var o = {
   async m() {
@@ -516,9 +516,9 @@ var et = async function<T>(a: T) {
   await 1;
 };
 
-var n = new async function() {
+var n = new (async function() {
   await 1;
-}();
+})();
 
 var o = {
   async m() {

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

@@ -369,6 +369,7 @@ typeof (function() {});
 export default (function() {})();
 (function() {})()\`\`;
 (function() {})\`\`;
+new (function() {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (function() {
 }).length;
@@ -380,6 +381,8 @@ export default (function() {
 })()\`\`;
 (function() {
 })\`\`;
+new (function() {
+})();
 "
 `;
 

tests/function/function_expression.js

@@ -3,3 +3,4 @@ typeof (function() {});
 export default (function() {})();
 (function() {})()``;
 (function() {})``;
+new (function() {});