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enhance collapse_vars (#4826)

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This commit is contained in:
Alex Lam S.L
2021-03-27 14:14:37 +00:00
committed by GitHub
parent 072933f1d5
commit d5599604e8
1 changed files with 12 additions and 7 deletions
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19
lib/compress.js
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@@ -1826,6 +1826,18 @@ merge(Compressor.prototype, {
can_replace = replace;
return signal_abort(node);
}
// Scan but don't replace inside block scope with colliding variable
if (node instanceof AST_BlockScope
&& !(node instanceof AST_Scope)
&& !(node.variables && node.variables.all(function(def) {
return !lvalues.has(def.name);
}))) {
var replace = can_replace;
can_replace = false;
if (!handle_custom_scan_order(node, scanner)) descend(node, scanner);
can_replace = replace;
return signal_abort(node);
}
return handle_custom_scan_order(node, scanner);
}, signal_abort);
var multi_replacer = new TreeTransformer(function(node) {
@@ -1964,13 +1976,6 @@ merge(Compressor.prototype, {
}
// Skip (non-executed) functions
if (node instanceof AST_Scope) return node;
// Stop upon collision with block-scoped variables
if (!(node.variables && node.variables.all(function(def) {
return !lvalues.has(def.name);
}))) {
abort = true;
return node;
}
// Scan object only in a for-in/of statement
if (node instanceof AST_ForEnumeration) {
node.object = node.object.transform(tt);