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fix corner case in unused (#4907)

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fixes #4906
This commit is contained in:
Alex Lam S.L
2021-05-03 23:19:25 +01:00
committed by GitHub
parent 5d9224deb8
commit ce3c35fa8b
2 changed files with 32 additions and 6 deletions
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21
lib/compress.js
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@@ -7671,12 +7671,21 @@ merge(Compressor.prototype, {
return expressions === this.expressions ? this : make_sequence(this, expressions);
});
def(AST_Sub, function(compressor, first_in_statement) {
if (this.expression.may_throw_on_access(compressor)) return this;
var expression = this.expression.drop_side_effect_free(compressor, first_in_statement);
if (!expression) return this.property.drop_side_effect_free(compressor, first_in_statement);
var property = this.property.drop_side_effect_free(compressor);
if (!property) return expression;
return make_sequence(this, [ expression, property ]);
var expr = this.expression;
var prop = this.property;
if (expr.may_throw_on_access(compressor)) {
if (!this.optional) return this;
prop = prop.drop_side_effect_free(compressor);
if (!prop) return expr.drop_side_effect_free(compressor, first_in_statement);
var node = this.clone();
node.property = prop;
return node;
}
expr = expr.drop_side_effect_free(compressor, first_in_statement);
if (!expr) return prop.drop_side_effect_free(compressor, first_in_statement);
prop = prop.drop_side_effect_free(compressor);
if (!prop) return expr;
return make_sequence(this, [ expr, prop ]);
});
def(AST_SymbolRef, function(compressor) {
return this.is_declared(compressor) && can_drop_symbol(this, compressor) ? null : this;