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fix corner case in merge_vars (#4289)

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fixes #4288
This commit is contained in:
Alex Lam S.L
2020-11-17 20:03:20 +00:00
committed by GitHub
parent 383163afa6
commit caa92aea5d
3 changed files with 48 additions and 8 deletions
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20
lib/compress.js
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@@ -4739,13 +4739,25 @@ merge(Compressor.prototype, {
if (node === self) root = segment;
if (node instanceof AST_Lambda) {
if (node.name) references[node.name.definition().id] = false;
node.each_argname(node.uses_arguments && !tw.has_directive("use strict") ? function(node) {
references[node.definition().id] = false;
var marker = node.uses_arguments && !tw.has_directive("use strict") ? function(node) {
if (node instanceof AST_SymbolFunarg) references[node.definition().id] = false;
} : function(node) {
mark(node, false, true);
if (node instanceof AST_SymbolFunarg) mark(node, false, true);
};
var scanner = new TreeWalker(function(ref) {
if (!(ref instanceof AST_SymbolRef)) return;
var def = ref.definition();
var ldef = node.variables.get(ref.name);
if (ldef && (ldef === def || def.undeclared || node.parent_scope.find_variable(ref) === def)) {
references[ldef.id] = false;
}
return true;
});
node.argnames.forEach(function(argname) {
argname.mark_symbol(marker, scanner);
});
}
descend();
walk_body(node, tw);
pop();
return true;
}