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fix corner cases in reduce_vars & unused (#4306)

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This commit is contained in:
Alex Lam S.L
2020-11-19 03:25:36 +00:00
committed by GitHub
parent 134ef0b1eb
commit 641406d491
3 changed files with 105 additions and 2 deletions
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7
lib/compress.js
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@@ -1085,7 +1085,10 @@ merge(Compressor.prototype, {
tw.loop_ids[d.id] = tw.in_loop;
d.fixed = fixed;
d.fixed.assigns = [ node ];
if (name instanceof AST_SymbolConst && d.redefined()) d.single_use = false;
if (name instanceof AST_SymbolConst && d.redefined()
|| !(can_drop_symbol(name) || is_safe_lexical(d))) {
d.single_use = false;
}
} else {
d.fixed = false;
}
@@ -5352,7 +5355,7 @@ merge(Compressor.prototype, {
return;
}
var sym = def.name.definition();
var drop_sym = !is_var || can_drop_symbol(def.name);
var drop_sym = is_var ? can_drop_symbol(def.name) : is_safe_lexical(sym);
if (!drop_sym || !drop_vars || sym.id in in_use_ids) {
if (def.value && indexOf_assign(sym, def) < 0) {
var write_only = def.value.write_only;