Handle curly brackets in SwitchCase types

src/printer.js

@@ -1057,15 +1057,22 @@ else
       parts.push("default:");
 
     if (n.consequent.length > 0) {
-      parts.push(indent(options.tabWidth, concat([
-        hardline,
-        path.call(
-          function(consequentPath) {
-            return printStatementSequence(consequentPath, options, print);
-          },
-          "consequent"
+      const cons = path.call(
+        function(consequentPath) {
+          return printStatementSequence(consequentPath, options, print);
+        },
+        "consequent"
+      );
+
+      parts.push(
+        indent(
+          options.tabWidth,
+          concat([
+            isCurlyBracket(cons) ? " " : hardline,
+            cons
+          ])
         )
-      ])));
+      );
     }
 
     return concat(parts);

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

@@ -113,13 +113,11 @@ function bar2(b) {
   if (x == null)
     return;
   switch (\"\") {
-  case 0:
-    {
+  case 0: {
       let y: number = x;
       x = \"\";
     }
-  case 1:
-    {
+  case 1: {
       let z: number = x;
       break;
     }

tests/disjoint-union-perf/__snapshots__/jsfmt.spec.js.snap

@@ -251,20 +251,17 @@ export function emitExpression(node: TypedNode): t.Expression {
       b.identifier(node.name),
       false
     );
-  case \"binary_op\":
-    {
+  case \"binary_op\": {
       const lhs = emitExpression(node.lhs);
       const rhs = emitExpression(node.rhs);
       const op = getBinaryOp(node.binaryOp);
       return b.binaryExpression(op, lhs, rhs);
     }
-  case \"unary_minus\":
-    {
+  case \"unary_minus\": {
       const operand = emitExpression(node.op);
       return b.unaryExpression(\"-\", operand, true);
     }
-  case \"function_invocation\":
-    {
+  case \"function_invocation\": {
       const callee = b.memberExpression(
         b.identifier(\"fns\"),
         b.identifier(node.name),