From f9a2a9d78e8437d8b9591e97ab280e20b9442b35 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Mon, 22 Feb 2021 07:44:16 +0000
Subject: enhance `side_effects` (#4675)

---
 lib/compress.js | 2 ++
 1 file changed, 2 insertions(+)

(limited to 'lib/compress.js')

diff --git a/lib/compress.js b/lib/compress.js
index 0a89de7e..c6451012 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -8516,6 +8516,8 @@ merge(Compressor.prototype, {
                             }
                         });
                         return node;
+                    } else if (!node.has_side_effects(compressor)) {
+                        self.drop_side_effect_free = return_null;
                     }
                 }
                 var arg_used, insert, in_loop, scope;
-- 
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