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make is_constant() recognize constants with several unary prefixes #1142

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make is_constant() recognize constants with several unary prefixes #1142

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8 changes: 6 additions & 2 deletions lib/compress/evaluate.js
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Expand Up @@ -109,8 +109,12 @@ AST_Node.DEFMETHOD("is_constant", function () {
return !(this instanceof AST_RegExp);
} else {
return this instanceof AST_UnaryPrefix
&& this.expression instanceof AST_Constant
&& unaryPrefix.has(this.operator);
&& unaryPrefix.has(this.operator)
&& (
// `this.expression` may be an `AST_RegExp`, so not only `.is_constant()`.
this.expression instanceof AST_Constant
|| this.expression.is_constant()
);
}
});

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