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http://www.typescriptlang.org/Playground#src=export%20interface%20INotificationService%20{%20%20%20%20error(message:%20string,%20title?:%20string,%20autoHideAfter?%20:%20number);}class%20X%20{error(message:%20string,%20title?:%20string,%20autoHideAfter?:%20number)%20{console.log(message,%20title,%20autoHideAfter);}}new%20X().error(