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fix corner case in unsafe (#4779)

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This commit is contained in:
Alex Lam S.L
2021-03-15 09:51:32 +00:00
committed by GitHub
parent 2619bff3cf
commit 149d75c092
2 changed files with 62 additions and 6 deletions
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17
lib/compress.js
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@@ -8533,20 +8533,25 @@ merge(Compressor.prototype, {
var separator = self.args[0];
// [].join() ---> ""
// [].join(x) ---> (x, "")
if (exp.expression.elements.length == 0) return separator ? make_sequence(self, [
separator,
make_node(AST_String, self, { value: "" }),
]).optimize(compressor) : make_node(AST_String, self, { value: "" });
if (exp.expression.elements.length == 0 && !(separator instanceof AST_Spread)) {
return separator ? make_sequence(self, [
separator,
make_node(AST_String, self, { value: "" }),
]).optimize(compressor) : make_node(AST_String, self, { value: "" });
}
if (separator) {
separator = separator.evaluate(compressor);
if (separator instanceof AST_Node) break EXIT; // not a constant
}
var elements = [];
var consts = [];
exp.expression.elements.forEach(function(el) {
for (var i = 0; i < exp.expression.elements.length; i++) {
var el = exp.expression.elements[i];
var value = el.evaluate(compressor);
if (value !== el) {
consts.push(value);
} else if (el instanceof AST_Spread) {
break EXIT;
} else {
if (consts.length > 0) {
elements.push(make_node(AST_String, self, {
@@ -8556,7 +8561,7 @@ merge(Compressor.prototype, {
}
elements.push(el);
}
});
}
if (consts.length > 0) elements.push(make_node(AST_String, self, {
value: consts.join(separator),
}));