Fixed invalid assertion in ts transformer
Fixed invalid assertion in ts transformer

jwbay/TypeScript,RyanCavanaugh/TypeScript,DLehenbauer/TypeScript,SaschaNaz/TypeScript,SaschaNaz/TypeScript,erikmcc/TypeScript,synaptek/TypeScript,basarat/TypeScript,microsoft/TypeScript,vilic/TypeScript,DLehenbauer/TypeScript,thr0w/Thr0wScript,donaldpipowitch/TypeScript,weswigham/TypeScript,synaptek/TypeScript,SaschaNaz/TypeScript,kpreisser/TypeScript,nojvek/TypeScript,nojvek/TypeScript,kitsonk/TypeScript,thr0w/Thr0wScript,basarat/TypeScript,Eyas/TypeScript,synaptek/TypeScript,Eyas/TypeScript,basarat/TypeScript,Eyas/TypeScript,Microsoft/TypeScript,microsoft/TypeScript,jeremyepling/TypeScript,TukekeSoft/TypeScript,jwbay/TypeScript,alexeagle/TypeScript,nojvek/TypeScript,weswigham/TypeScript,mihailik/TypeScript,donaldpipowitch/TypeScript,Microsoft/TypeScript,nojvek/TypeScript,minestarks/TypeScript,kpreisser/TypeScript,thr0w/Thr0wScript,erikmcc/TypeScript,microsoft/TypeScript,alexeagle/TypeScript,mihailik/TypeScript,vilic/TypeScript,DLehenbauer/TypeScript,DLehenbauer/TypeScript,chuckjaz/TypeScript,alexeagle/TypeScript,thr0w/Thr0wScript,donaldpipowitch/TypeScript,TukekeSoft/TypeScript,jwbay/TypeScript,basarat/TypeScript,chuckjaz/TypeScript,minestarks/TypeScript,vilic/TypeScript,RyanCavanaugh/TypeScript,Eyas/TypeScript,SaschaNaz/TypeScript,synaptek/TypeScript,kpreisser/TypeScript,jeremyepling/TypeScript,TukekeSoft/TypeScript,weswigham/TypeScript,RyanCavanaugh/TypeScript,mihailik/TypeScript,jwbay/TypeScript,erikmcc/TypeScript,erikmcc/TypeScript,Microsoft/TypeScript,donaldpipowitch/TypeScript,jeremyepling/TypeScript,chuckjaz/TypeScript,chuckjaz/TypeScript,kitsonk/TypeScript,vilic/TypeScript,kitsonk/TypeScript,mihailik/TypeScript,minestarks/TypeScript