Restore `NewFileContent` type (#25406)
Restore `NewFileContent` type (#25406)


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