TS6059 reports half-true reason for file being in the program

[rulatir]

Bug Report

I am going to take a calculated risk here and skip the 1.5h work of form filling, because this seems to be a really simple issue.

This error message is half-true and misleading:

error TS6059: File '/fasthome/rulatir/works/zrup/utility/ts/jsdoc.ts' is not under 'rootDir' '/fasthome/rulatir/works/zrup/ts'. 'rootDir' is expected to contain all source files.
  The file is in the program because:
    Matched by include pattern '**/*' in '/fasthome/rulatir/works/zrup/tsconfig.json'

The claim in the last line is false. There is no '**/*' include pattern specified anywhere in my tsconfig.json. There is no key in my entire tsconfig.json that contains case-insensitive strings "include" or "pattern". There is not a single occurrence of the string '**/*' in my tsconfig.json.

What this means is that the offending value actually comes from defaults, and should be overriden in tsconfig.json by adding an appropriate key.

Expected last line of the error message:

    Matched by the default include pattern '**/*' (override by setting the <whatever it is named> option in tsconfig.json)

[DanielRosenwasser]

If there's a way to detect whether a rule came from the defaults, it would be nice to call that out in --explainFiles.