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replace (function(){ ...no side effects ... })() with undefined.

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Mihai Bazon
2012-10-05 16:51:16 +03:00
parent 7ae09120ed
commit a1e0885930
1 changed files with 13 additions and 3 deletions
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16
lib/compress.js
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@@ -673,16 +673,19 @@ merge(Compressor.prototype, {
def(AST_EmptyStatement, function(){ return false });
def(AST_Constant, function(){ return false });
def(AST_This, function(){ return false });
def(AST_Function, function(){ return false });
def(AST_BlockStatement, function(){
function block(){
for (var i = this.body.length; --i >= 0;) {
if (this.body[i].has_side_effects())
return true;
}
return false;
});
};
def(AST_Block, block);
def(AST_BlockStatement, block);
def(AST_SimpleStatement, function(){
if (this.body instanceof AST_Function) return false;
return this.body.has_side_effects();
});
def(AST_Binary, function(){
@@ -1281,6 +1284,13 @@ merge(Compressor.prototype, {
});
}
}
if (compressor.option("side_effects")) {
if (self.expression instanceof AST_Function
&& self.args.length == 0
&& !self.expression.has_side_effects()) {
return make_node(AST_Undefined, self);
}
}
return self;
});