From 86c65d1f81e330890ac4453a2c7c063b0ffb5024 Mon Sep 17 00:00:00 2001
From: Brian Ng <bng412@gmail.com>
Date: Mon, 16 Jan 2017 11:08:46 -0600
Subject: [PATCH] Fix missing parenthesis for typeof and arrow functions (#249)

---
 src/fast-path.js                              | 11 +++++++----
 tests/arrows/__snapshots__/jsfmt.spec.js.snap |  3 +++
 tests/arrows/arrow_function_expression.js     |  1 +
 3 files changed, 11 insertions(+), 4 deletions(-)

diff --git a/src/fast-path.js b/src/fast-path.js
index af4392cb..dd4b2b55 100644
--- a/src/fast-path.js
+++ b/src/fast-path.js
@@ -371,11 +371,14 @@ FPp.needsParens = function(assumeExpressionContext) {
         return true;
       }
 
-      if (parent.type === "MemberExpression") {
-        return true;
-      }
+      switch (parent.type) {
+        case "MemberExpression":
+        case "UnaryExpression":
+          return true;
 
-      return isBinary(parent);
+        default:
+          return isBinary(parent);
+      }
 
     case "ClassExpression":
       return parent.type === "ExpressionStatement";
diff --git a/tests/arrows/__snapshots__/jsfmt.spec.js.snap b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
index 728c2470..bf224ddd 100644
--- a/tests/arrows/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
@@ -27,9 +27,12 @@ var ident = <T>(x: T): T => x;
 
 exports[`test arrow_function_expression.js 1`] = `
 "(a => {}).length
+typeof (() => {});
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (a => {
 }).length;
+typeof (() => {
+});
 "
 `;
 
diff --git a/tests/arrows/arrow_function_expression.js b/tests/arrows/arrow_function_expression.js
index ecea2142..57a6e920 100644
--- a/tests/arrows/arrow_function_expression.js
+++ b/tests/arrows/arrow_function_expression.js
@@ -1 +1,2 @@
 (a => {}).length
+typeof (() => {});