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fix corner case in assignments #3430

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merged 1 commit into from May 29, 2019
Merged

fix corner case in assignments #3430

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2 changes: 1 addition & 1 deletion lib/compress.js
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Expand Up @@ -3856,7 +3856,7 @@ merge(Compressor.prototype, {
if (!(rhs instanceof AST_Binary && lazy_op[rhs.operator])) return rhs;
var sym = assign.left;
if (!(sym instanceof AST_SymbolRef) || sym.name != rhs.left.name) return rhs;
return rhs.right;
return rhs.right.has_side_effects(compressor) ? rhs : rhs.right;
}

function scan_ref_scoped(node, descend) {
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46 changes: 46 additions & 0 deletions test/compress/assignment.js
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Expand Up @@ -327,3 +327,49 @@ issue_3427: {
}
expect: {}
}

issue_3429_1: {
options = {
assignments: true,
side_effects: true,
unused: true,
}
input: {
var a = "PASS";
(function(b) {
b && (b = a = "FAIL");
})();
console.log(a);
}
expect: {
var a = "PASS";
(function(b) {
b = b && (a = "FAIL");
})();
console.log(a);
}
expect_stdout: "PASS"
}

issue_3429_2: {
options = {
assignments: true,
side_effects: true,
unused: true,
}
input: {
var a;
(function(b) {
b || (b = a = "FAIL");
})(42);
console.log(a);
}
expect: {
var a;
(function(b) {
b = b || (a = "FAIL");
})(42);
console.log(a);
}
expect_stdout: "undefined"
}