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fix corner case in collapse_vars #3885

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merged 1 commit into from
May 11, 2020
Merged

fix corner case in collapse_vars #3885

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1 change: 1 addition & 0 deletions lib/compress.js
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Original file line number Diff line number Diff line change
Expand Up @@ -1239,6 +1239,7 @@ merge(Compressor.prototype, {
col: node.start.col
});
if (candidate instanceof AST_UnaryPostfix) {
delete candidate.expression.fixed;
return make_node(AST_UnaryPrefix, candidate, candidate);
}
if (candidate instanceof AST_VarDef) {
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25 changes: 25 additions & 0 deletions test/compress/collapse_vars.js
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Expand Up @@ -7954,3 +7954,28 @@ mangleable_var: {
}
expect_stdout: "PASS"
}

issue_3884: {
options = {
collapse_vars: true,
evaluate: true,
reduce_vars: true,
side_effects: true,
toplevel: true,
unused: true,
}
input: {
var a = 100, b = 1;
{
a++ + a || a;
b <<= a;
}
console.log(a, b);
}
expect: {
var a = 100;
++a;
console.log(a, 32);
}
expect_stdout: "101 32"
}