Allow for undefined in type
Allow for undefined in type

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