Array Check for Bug #28

[Cleanshooter]

I think this will resolve the reported bug. However, I don't know how to setup a development environment like yours.

When I try to run npm run build I get an error:

src/filesystem.ts:61:7 - error TS2345: Argument of type '{ tsConfigFilePath: string | undefined; addFilesFromTsConfig: boolean; skipFileDependencyResolution: true; }' is not assignable to parameter of type 'ProjectOptions'.
  Object literal may only specify known properties, and 'addFilesFromTsConfig' does not exist in type 'ProjectOptions'.

61       addFilesFromTsConfig: false,
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~


Found 1 error.