Print comment after key (#1131)

src/printer.js

@@ -1985,7 +1985,10 @@ function printPropertyKey(path, options, print) {
     (options.parser !== "flow" || key.value.match(/[a-zA-Z0-9$_]/))
   ) {
     // 'a' -> a
-    return key.value;
+    return path.call(
+      keyPath => comments.printComments(keyPath, p => key.value, options),
+      "key"
+    );
   }
   return path.call(print, "key");
 }

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

@@ -1,5 +1,24 @@
 // Jest Snapshot v1, https://goo.gl/fbAQLP
 
+exports[`after-key.js 1`] = `
+"let a = {
+   a /* comment */: () => 1
+};
+
+let a = {
+   \\"a\\" /* comment */: () => 1
+};
+~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
+let a = {
+  a /* comment */: () => 1
+};
+
+let a = {
+  a /* comment */: () => 1
+};
+"
+`;
+
 exports[`comment.js 1`] = `
 "o = {
   name:

tests/object_property_comment/after-key.js

@@ -0,0 +1,7 @@
+let a = {
+   a /* comment */: () => 1
+};
+
+let a = {
+   "a" /* comment */: () => 1
+};