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fix corner case in arguments (#4609)

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fixes #4608
This commit is contained in:
Alex Lam S.L
2021-02-02 15:07:31 +00:00
committed by GitHub
parent 7110c6923b
commit 3c556b8689
3 changed files with 51 additions and 10 deletions
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11
lib/scope.js
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@@ -101,6 +101,14 @@ SymbolDef.prototype = {
var unary_side_effects = makePredicate("delete ++ --");
function is_lhs(node, parent) {
if (parent instanceof AST_Assign) return parent.left === node && node;
if (parent instanceof AST_DefaultValue) return parent.name === node && node;
if (parent instanceof AST_Destructured) return node;
if (parent instanceof AST_DestructuredKeyVal) return node;
if (parent instanceof AST_Unary) return unary_side_effects[parent.operator] && parent.expression;
}
AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
options = defaults(options, {
cache: null,
@@ -269,8 +277,7 @@ AST_Toplevel.DEFMETHOD("figure_out_scope", function(options) {
sym = self.def_global(node);
} else if (name == "arguments" && is_arguments(sym)) {
var parent = tw.parent();
if (parent instanceof AST_Assign && parent.left === node
|| parent instanceof AST_Unary && unary_side_effects[parent.operator]) {
if (is_lhs(node, parent)) {
sym.scope.uses_arguments = 3;
} else if (sym.scope.uses_arguments < 2
&& !(parent instanceof AST_PropAccess && parent.expression === node)) {