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Account for side effects in string + expr optimization

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This commit is contained in:
kzc
2016-09-01 09:24:56 -04:00
parent 0bd8053524
commit 25fc02743a
2 changed files with 51 additions and 2 deletions
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4
lib/compress.js
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@@ -2499,8 +2499,8 @@ merge(Compressor.prototype, {
case "+":
var ll = self.left.evaluate(compressor);
var rr = self.right.evaluate(compressor);
if ((ll.length > 1 && ll[0] instanceof AST_String && ll[1]) ||
(rr.length > 1 && rr[0] instanceof AST_String && rr[1])) {
if ((ll.length > 1 && ll[0] instanceof AST_String && ll[1] && !self.right.has_side_effects(compressor)) ||
(rr.length > 1 && rr[0] instanceof AST_String && rr[1] && !self.left.has_side_effects(compressor))) {
compressor.warn("+ in boolean context always true [{file}:{line},{col}]", self.start);
return make_node(AST_True, self);
}