add assert
add assert

Microsoft/TypeScript,RyanCavanaugh/TypeScript,kpreisser/TypeScript,weswigham/TypeScript,weswigham/TypeScript,minestarks/TypeScript,nojvek/TypeScript,kitsonk/TypeScript,RyanCavanaugh/TypeScript,alexeagle/TypeScript,nojvek/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,RyanCavanaugh/TypeScript,minestarks/TypeScript,nojvek/TypeScript,microsoft/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,SaschaNaz/TypeScript,nojvek/TypeScript,SaschaNaz/TypeScript,alexeagle/TypeScript,kitsonk/TypeScript,Microsoft/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,microsoft/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,minestarks/TypeScript,SaschaNaz/TypeScript