Fix format of comment in paren of call expression in arrow expression (#3334)

src/comments.js

@@ -683,7 +683,9 @@ function handleCommentInEmptyParens(text, enclosingNode, comment) {
     enclosingNode &&
     (((enclosingNode.type === "FunctionDeclaration" ||
       enclosingNode.type === "FunctionExpression" ||
-      enclosingNode.type === "ArrowFunctionExpression" ||
+      (enclosingNode.type === "ArrowFunctionExpression" &&
+        (enclosingNode.body.type !== "CallExpression" ||
+          enclosingNode.body.arguments.length === 0)) ||
       enclosingNode.type === "ClassMethod" ||
       enclosingNode.type === "ObjectMethod") &&
       enclosingNode.params.length === 0) ||

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

@@ -44,6 +44,9 @@ f(/* ... */);
 f(a, /* ... */);
 f(a, /* ... */ b);
 f(/* ... */ a, b);
+
+let f = () => import(a /* ... */);
+let f = () => doThing(a, /* ... */ b);
 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 let f = (/* ... */) => {};
 (function(/* ... */) {})(/* ... */);
@@ -72,4 +75,7 @@ f(a /* ... */);
 f(a, /* ... */ b);
 f(/* ... */ a, b);
 
+let f = () => import(a /* ... */);
+let f = () => doThing(a, /* ... */ b);
+
 `;

tests/empty_paren_comment/empty_paren_comment.js

@@ -23,3 +23,6 @@ f(/* ... */);
 f(a, /* ... */);
 f(a, /* ... */ b);
 f(/* ... */ a, b);
+
+let f = () => import(a /* ... */);
+let f = () => doThing(a, /* ... */ b);