From a6bb66931bfdd04d6ce05b640d89a8deff7ca3de Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sat, 13 Feb 2021 18:24:57 +0000
Subject: improve fix for #4325 (#4649)

---
 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 38d25b15..7e113ecc 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7003,6 +7003,8 @@ merge(Compressor.prototype, {
                 // always shallow clone to ensure stripping of negated IIFEs
                 self = self.clone();
                 self.expression = exp.clone();
+                // avoid extraneous traversal
+                if (exp._squeezed) self.expression._squeezed = true;
             }
             if (self instanceof AST_New) {
                 var fn = exp;
-- 
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