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enhance reduce_vars (#5171)

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This commit is contained in:
Alex Lam S.L
2021-11-13 14:18:56 +00:00
committed by GitHub
parent e9932e1314
commit f97e107c09
4 changed files with 74 additions and 7 deletions
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4
lib/compress.js
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@@ -613,12 +613,14 @@ merge(Compressor.prototype, {
if (def.single_use == "m") return false;
var safe = tw.safe_ids[def.id];
if (safe) {
if (!HOP(tw.safe_ids, def.id)) safe.read = safe.read && safe.read !== tw.safe_ids ? true : tw.safe_ids;
var in_order = HOP(tw.safe_ids, def.id);
if (!in_order) safe.read = safe.read && safe.read !== tw.safe_ids ? true : tw.safe_ids;
if (def.fixed == null) {
if (is_arguments(def)) return false;
if (def.global && def.name == "arguments") return false;
tw.loop_ids[def.id] = null;
def.fixed = make_node(AST_Undefined, def.orig[0]);
if (in_order) delete def.safe_ids;
return true;
}
return !safe.assign || safe.assign === tw.safe_ids;