handle a => a at top level – fixes #403

src/ast/isReference.js

@@ -4,6 +4,8 @@ export default function isReference ( node, parent ) {
 	}
 
 	if ( node.type === 'Identifier' ) {
+		if ( !parent ) return true;
+
 		// TODO is this right?
 		if ( parent.type === 'MemberExpression' ) return parent.computed || node === parent.object;
 

test/function/top-level-arrow-function/_config.js

@@ -0,0 +1,3 @@
+module.exports = {
+	description: 'handles naked return value from top-level arrow function expression (#403)'
+};

test/function/top-level-arrow-function/main.js

@@ -0,0 +1,2 @@
+const f = a => a;
+assert.equal( f( 42 ), 42 );