From 332babe77dd3dd742833fac3166908cbd35b07ba Mon Sep 17 00:00:00 2001
From: Dan Harper <intouch@danharper.me>
Date: Wed, 15 Mar 2017 16:38:13 +0000
Subject: [PATCH] Fix single optional arrow param printing (#1002)

---
 src/printer.js                                | 1 +
 tests/arrows/__snapshots__/jsfmt.spec.js.snap | 2 ++
 tests/arrows/arrow_function_expression.js     | 1 +
 3 files changed, 4 insertions(+)

diff --git a/src/printer.js b/src/printer.js
index 9efe3087..d14e07ac 100644
--- a/src/printer.js
+++ b/src/printer.js
@@ -315,6 +315,7 @@ function genericPrintNoParens(path, options, print) {
         !n.params[0].typeAnnotation &&
         !n.params[0].leadingComments &&
         !n.params[0].trailingComments &&
+        !n.params[0].optional &&
         !n.predicate &&
         !n.returnType
       ) {
diff --git a/tests/arrows/__snapshots__/jsfmt.spec.js.snap b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
index 2d71164c..fa959434 100644
--- a/tests/arrows/__snapshots__/jsfmt.spec.js.snap
+++ b/tests/arrows/__snapshots__/jsfmt.spec.js.snap
@@ -30,6 +30,7 @@ x => ({}().b);
 (a => b)::c;
 a::(b => c);
 a = b => c;
+a = (b?) => c;
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 (a => {}).length;
 typeof (() => {});
@@ -61,6 +62,7 @@ x => ({}().b);
 (a => b)::c;
 a::(b => c);
 a = b => c;
+a = (b?) => c;
 "
 `;
 
diff --git a/tests/arrows/arrow_function_expression.js b/tests/arrows/arrow_function_expression.js
index 20f801c7..3435c417 100644
--- a/tests/arrows/arrow_function_expression.js
+++ b/tests/arrows/arrow_function_expression.js
@@ -27,3 +27,4 @@ x => ({}().b);
 (a => b)::c;
 a::(b => c);
 a = b => c;
+a = (b?) => c;