fix corner case in booleans (#4246)

fixes #4245
2020-10-26 10:53:58 +00:00
parent b2775746a7
commit 607f87c5cd
4 changed files with 47 additions and 2 deletions
--- a/lib/compress.js
+++ b/lib/compress.js
@@ -7598,7 +7598,9 @@ merge(Compressor.prototype, {
                // typeof always returns a non-empty string, thus it's
                // always true in booleans
                AST_Node.warn("Boolean expression always true [{file}:{line},{col}]", self.start);
-                return (exp instanceof AST_SymbolRef ? make_node(AST_True, self) : make_sequence(self, [
+                return (exp instanceof AST_SymbolRef && all(exp.definition().orig, function(sym) {
+                    return !(sym instanceof AST_SymbolConst || sym instanceof AST_SymbolLet);
+                }) ? make_node(AST_True, self) : make_sequence(self, [
                    exp,
                    make_node(AST_True, self)
                ])).optimize(compressor);