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add docs

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alexlamsl 2017-04-07 01:24:15 +08:00
parent 218547048b
commit 5915190dcc
1 changed files with 2 additions and 0 deletions
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lib/compress.js
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@ -1166,6 +1166,8 @@ merge(Compressor.prototype, {
&& !node.expression.has_side_effects(compressor); && !node.expression.has_side_effects(compressor);
} }
// may_eq_null()
// returns true if this node may evaluate to null or undefined
(function(def) { (function(def) {
def(AST_Node, return_true); def(AST_Node, return_true);
def(AST_Null, return_true); def(AST_Null, return_true);