error TS6053: File 'a.ts' not found.
  The file is in the program because:
    Root file specified for compilation
error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
  The file is in the program because:
    Root file specified for compilation
error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
  The file is in the program because:
    Root file specified for compilation


!!! error TS6053: File 'a.ts' not found.
!!! error TS6053:   The file is in the program because:
!!! error TS6053:     Root file specified for compilation
!!! error TS6054: File 'a.t' has an unsupported extension. The only supported extensions are '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
!!! error TS6054:   The file is in the program because:
!!! error TS6054:     Root file specified for compilation
!!! error TS6231: Could not resolve the path 'a' with the extensions: '.ts', '.tsx', '.d.ts', '.cts', '.d.cts', '.mts', '.d.mts'.
!!! error TS6231:   The file is in the program because:
!!! error TS6231:     Root file specified for compilation