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fix corner case in assignments (#5671)

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fixes #5670
This commit is contained in:
Alex Lam S.L
2022-09-21 00:56:16 +01:00
committed by GitHub
parent 3a6e58109e
commit 9efa02afb6
2 changed files with 35 additions and 8 deletions
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23
lib/compress.js
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@@ -11590,22 +11590,29 @@ Compressor.prototype.compress = function(node) {
if (seq !== self) return seq.optimize(compressor);
}
if (compressor.option("assignments") && lazy_op[self.operator]) {
var assign = self.right;
var right = self.right;
// a || (a = x) ---> a = a || x
// a && (a = x) ---> a = a && x
if (self.left instanceof AST_SymbolRef
&& assign instanceof AST_Assign
&& assign.operator == "="
&& self.left.equals(assign.left)) {
return make_node(AST_Assign, self, {
&& right instanceof AST_Assign
&& right.operator == "="
&& self.left.equals(right.left)) {
var left = right.left.clone();
var assign = make_node(AST_Assign, self, {
operator: "=",
left: assign.left,
left: left,
right: make_node(AST_Binary, self, {
operator: self.operator,
left: self.left,
right: assign.right,
right: right.right,
}),
}).optimize(compressor);
});
left.fixed = function() {
return assign.right;
};
left.fixed.assigns = [ assign ];
left.definition().references.push(left);
return assign.optimize(compressor);
}
}
if (compressor.option("comparisons")) switch (self.operator) {