Add type annotation into services so _services_ API baseline is stable post-LKG (#42028)
Add type annotation into services so _services_ API baseline is stable post-LKG (#42028)


microsoft/TypeScript,microsoft/TypeScript,kpreisser/TypeScript,kpreisser/TypeScript,kitsonk/TypeScript,weswigham/TypeScript,weswigham/TypeScript,SaschaNaz/TypeScript,weswigham/TypeScript,Microsoft/TypeScript,microsoft/TypeScript,kitsonk/TypeScript,kitsonk/TypeScript,SaschaNaz/TypeScript,kpreisser/TypeScript,RyanCavanaugh/TypeScript,SaschaNaz/TypeScript,SaschaNaz/TypeScript,Microsoft/TypeScript,Microsoft/TypeScript,RyanCavanaugh/TypeScript,RyanCavanaugh/TypeScript