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fix corner case in unused (#5361)

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fixes #5360
This commit is contained in:
Alex Lam S.L
2022-02-19 18:26:51 +00:00
committed by GitHub
parent a7d06167a0
commit fbc5ecf75a
2 changed files with 60 additions and 7 deletions
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31
lib/compress.js
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@@ -7734,16 +7734,37 @@ Compressor.prototype.compress = function(node) {
return prop.key instanceof AST_Node && prop.key.has_side_effects(compressor);
}
function clear_write_only(node) {
if (node instanceof AST_Assign) {
node.write_only = false;
clear_write_only(node.right);
} else if (node instanceof AST_Binary) {
if (!lazy_op[node.operator]) return;
clear_write_only(node.left);
clear_write_only(node.right);
} else if (node instanceof AST_Conditional) {
clear_write_only(node.consequent);
clear_write_only(node.alternative);
} else if (node instanceof AST_Sequence) {
clear_write_only(node.tail_node());
} else if (node instanceof AST_Unary) {
node.write_only = false;
}
}
function retain_lhs(node) {
if (node instanceof AST_DefaultValue) return retain_lhs(node.name);
if (node instanceof AST_Destructured) {
if (value === null) {
value = make_node(AST_Number, node, { value: 0 });
} else if (value && (value.tail_node().write_only === true
|| value.may_throw_on_access(compressor, true))) {
value = make_node(AST_Array, node, {
elements: value instanceof AST_Sequence ? value.expressions : [ value ],
});
} else if (value) {
if (value.may_throw_on_access(compressor, true)) {
value = make_node(AST_Array, node, {
elements: value instanceof AST_Sequence ? value.expressions : [ value ],
});
} else {
clear_write_only(value);
}
}
return make_node(AST_DestructuredObject, node, { properties: [] });
}