noop support for ArrowFunctionExpression

lib/hooks/ArrowFunctionExpression.js

@@ -42,7 +42,15 @@ function shouldHandleParams(node) {
 }
 
 function shouldIndentBody(node, opts) {
- // we don't want to indent the body twice if ObjectExpression or
- // ArrayExpression or CallExpression
- return node.body.type === 'BlockStatement' || !opts[node.body.type];
+ var bodyFirstNonEmpty = tk.findNextNonEmpty(node.body.startToken);
+
+ if (bodyFirstNonEmpty.value === '}') {
+ // noop
+ limit.after(node.body.startToken, 0);
+ return false;
+ } else {
+ // we don't want to indent the body twice if ObjectExpression or
+ // ArrayExpression or CallExpression
+ return node.body.type === 'BlockStatement' || !opts[node.body.type];
+ }
 }

test/compare/default/arrow_function_expression-in.js

@@ -7,6 +7,13 @@ arr.map(d =>
  {return d * 2;});
  arr.map( ( e , f , g) => e * f - g );
 
+// noop (#487)
+const f1 = () => {};
+const f2 = ( ) => { };
+const f3 = ( ) => {
+
+};
+
 // default params (#285)
 let defaultParams = (x, y = 1, z = 2 ) => {
  return x + y + z;

test/compare/default/arrow_function_expression-out.js

@@ -10,6 +10,11 @@ arr.map(d => {
 });
 arr.map((e, f, g) => e * f - g);
 
+// noop (#487)
+const f1 = () => {};
+const f2 = () => {};
+const f3 = () => {};
+
 // default params (#285)
 let defaultParams = (x, y = 1, z = 2) => {
  return x + y + z;