Preserve comment for last arg of ObjectMethod (#1216)

* Preserve comment after last arg of ObjectMethod

* Preserve comment after last arg with default value

src/comments.js

@@ -567,11 +567,13 @@ function handleLastFunctionArgComments(
   // Real functions
   if (
     precedingNode &&
-    precedingNode.type === "Identifier" &&
+    (precedingNode.type === "Identifier" ||
+      precedingNode.type === "AssignmentPattern") &&
     enclosingNode &&
     (enclosingNode.type === "ArrowFunctionExpression" ||
       enclosingNode.type === "FunctionExpression" ||
       enclosingNode.type === "FunctionDeclaration" ||
+      enclosingNode.type === "ObjectMethod" ||
       enclosingNode.type === "ClassMethod") &&
     getNextNonSpaceNonCommentCharacter(text, comment) === ")"
   ) {

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

@@ -692,6 +692,26 @@ function f(
 ): number {
   return a + 1;
 }
+
+var x = {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {
+  }
+}
+
+class X {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData = ['unknown']
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {
+  }
+}
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 type f = (
   currentRequest: { a: number }
@@ -727,6 +747,24 @@ function f(
   return a + 1;
 }
 
+var x = {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {}
+};
+
+class X {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData = ["unknown"]
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {}
+}
+
 `;
 
 exports[`preserve-new-line-last.js 1`] = `

tests/comments/last-arg.js

@@ -31,3 +31,23 @@ function f(
 ): number {
   return a + 1;
 }
+
+var x = {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {
+  }
+}
+
+class X {
+  getSectionMode(
+    pageMetaData: PageMetaData,
+    sectionMetaData: SectionMetaData = ['unknown']
+    /* $FlowFixMe This error was exposed while converting keyMirror
+     * to keyMirrorRecursive */
+  ): $Enum<SectionMode> {
+  }
+}