Fix a bug with expanding function args by passing group opts properly

src/printer.js

@@ -1775,7 +1775,7 @@ function printArgumentsList(path, options, print) {
           { shouldBreak: true }
         ),
       ],
-      shouldBreak
+      { shouldBreak }
     );
   }
 
@@ -1789,7 +1789,7 @@ function printArgumentsList(path, options, print) {
       softline,
       ")"
     ]),
-    shouldBreak
+    { shouldBreak }
   );
 }
 

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

@@ -94,9 +94,12 @@ function reduce_test() {
     return previousValue + currentValue + array[index];
   });
 
-  [ 0, 1, 2, 3, 4 ].reduce(function(previousValue, currentValue, index, array) {
+  [ 0, 1, 2, 3, 4 ].reduce(
+    function(previousValue, currentValue, index, array) {
       return previousValue + currentValue + array[index];
-    }, 10);
+    },
+    10
+  );
 
   var total = [ 0, 1, 2, 3 ].reduce(function(a, b) {
     return a + b;

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

@@ -22,19 +22,22 @@ geolocation.clearWatch(id);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 /* @flow */
 var geolocation = new Geolocation();
-var id = geolocation.watchPosition(position => {
-  var coords: Coordinates = position.coords;
-  var accuracy: number = coords.accuracy;
-}, e => {
-  var message: string = e.message;
-  switch (e.code) {
-  case e.PERMISSION_DENIED:
-  case e.POSITION_UNAVAILABLE:
-  case e.TIMEOUT:
-  default:
-    break;
+var id = geolocation.watchPosition(
+  position => {
+    var coords: Coordinates = position.coords;
+    var accuracy: number = coords.accuracy;
+  },
+  e => {
+    var message: string = e.message;
+    switch (e.code) {
+    case e.PERMISSION_DENIED:
+    case e.POSITION_UNAVAILABLE:
+    case e.TIMEOUT:
+    default:
+      break;
+    }
   }
-});
+);
 
 geolocation.clearWatch(id);
 "

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

@@ -1461,9 +1461,12 @@ exports[`test test20.js 1`] = `
 // Array#reduce
 [ 0, 1 ].reduce((x, y, i) => y);
 
-[ \"a\", \"b\" ].reduce((regex, representation, index) => {
+[ \"a\", \"b\" ].reduce(
+  (regex, representation, index) => {
     return regex + ((index ? \"|\" : \"\")) + \"(\" + representation + \")\";
-  }, \"\");
+  },
+  \"\"
+);
 
 [ \"\" ].reduce((acc, str) => acc * str.length);
 "