optimize trivial arrow functions with a return statement in braces (#1681)

fixes #1676
2017-03-26 00:03:11 -04:00
parent 9e2290b29c
commit 6a54de79b5
2 changed files with 21 additions and 1 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -3943,6 +3943,14 @@ merge(Compressor.prototype, {
        return self;
    });

+    OPT(AST_Arrow, function(self, compressor){
+        if (self.body.length === 1 && self.body[0] instanceof AST_Return) {
+            var value = self.body[0].value;
+            self.body = value ? value : [];
+        }
+        return self;
+    });
+
    OPT(AST_Class, function(self, compressor){
        // HACK to avoid compress failure.
        // AST_Class is not really an AST_Scope/AST_Block as it lacks a body.