Ignore generic mapped types in isStringIndexSignatureOnlyType
Ignore generic mapped types in isStringIndexSignatureOnlyType

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