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fix corner case in evaluate (#3569)

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This commit is contained in:
Alex Lam S.L
2019-11-04 13:13:48 +08:00
committed by GitHub
parent 0f2687ecfc
commit 0e29ad5eb9
2 changed files with 29 additions and 1 deletions
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6
lib/compress.js
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@@ -2881,6 +2881,7 @@ merge(Compressor.prototype, {
if (!non_converting_binary[this.operator]) depth++;
var left = this.left._eval(compressor, cached, depth);
if (left === this.left) return this;
if (this.operator == (left ? "||" : "&&")) return left;
var right = this.right._eval(compressor, cached, depth);
if (right === this.right) return this;
var result;
@@ -3049,7 +3050,10 @@ merge(Compressor.prototype, {
cached.push(node);
});
});
return stat.value ? stat.value._eval(compressor, cached, depth) : undefined;
if (!stat.value) return undefined;
var val = stat.value._eval(compressor, cached, depth);
if (val === stat.value) return this;
return val;
} else if (compressor.option("unsafe") && exp instanceof AST_PropAccess) {
var key = exp.property;
if (key instanceof AST_Node) {