fix ambient context
fix ambient context

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