From 63adfb1590886b9b03827805e1226bfe235e5868 Mon Sep 17 00:00:00 2001
From: "Alex Lam S.L" <alexlamsl@gmail.com>
Date: Sun, 10 May 2020 15:23:09 +0100
Subject: fix corner case in `hoist_props` (#3872)

fixes #3871
---
 lib/compress.js | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'lib')

diff --git a/lib/compress.js b/lib/compress.js
index 4f5e9253..5509137b 100644
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -4931,7 +4931,11 @@ merge(Compressor.prototype, {
             if (def.single_use) return;
             if (top_retain(def)) return;
             if (sym.fixed_value() !== right) return;
-            return right instanceof AST_Object && right.properties.length > 0;
+            return right instanceof AST_Object
+                && right.properties.length > 0
+                && all(right.properties, function(prop) {
+                    return prop instanceof AST_ObjectKeyVal;
+                });
         }
     });
 
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