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fix corner case in sequences (#3350)

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This commit is contained in:
Alex Lam S.L
2019-03-20 14:54:26 +08:00
committed by GitHub
parent f2286c33f1
commit 143f9054da
2 changed files with 29 additions and 11 deletions
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10
lib/compress.js
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@@ -4080,12 +4080,10 @@ merge(Compressor.prototype, {
def(AST_ObjectProperty, function(compressor, first_in_statement) {
return this.value.drop_side_effect_free(compressor, first_in_statement);
});
def(AST_Sequence, function(compressor) {
var last = this.tail_node();
var expr = last.drop_side_effect_free(compressor);
if (expr === last) return this;
var expressions = this.expressions.slice(0, -1);
if (expr) expressions.push(expr);
def(AST_Sequence, function(compressor, first_in_statement) {
var expressions = trim(this.expressions, compressor, first_in_statement);
if (expressions === this.expressions) return this;
if (!expressions) return null;
return make_sequence(this, expressions);
});
def(AST_Sub, function(compressor, first_in_statement) {