define(["./kernel","./lang","../on"],function(b,e,c){var d=window,a={addOnWindowUnload:function(a,f){b.windowUnloaded||c(d,"unload",b.windowUnloaded=function(){});c(d,"unload",e.hitch(a,f))},addOnUnload:function(a,b){c(d,"beforeunload",e.hitch(a,b))}};b.addOnWindowUnload=a.addOnWindowUnload;b.addOnUnload=a.addOnUnload;return a});
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