fix(tsconfig): allow null on tsBuildInfoFile

[wtchnm]

See microsoft/TypeScript#38493

[hyperupcall]

Please tell me if I am misunderstanding, but the linked issue seems to state that null is only available on the command line, as per microsoft/TypeScript#36997?

[wtchnm]

The linked PR adds support for passing this option via the command line, but it also works in tsconfig. Check out this experiment: https://codespaces.new/wtchnm/3367 or https://github.com/wtchnm/3367.

[hyperupcall]

Thank you for the link. It appears that the value is valid and is parsed, but unfortunately, the option is not documented. I checked the tsconfig and cli reference, but it was not mentioned.

This repository has a policy of requiring all features in the schema to be documented. More information at this link.

[hyperupcall]

I have opened #3372 because I disagree with the "policy" and want to merge changes like this. Once everyone is on the same page, and it is accepted, then I will happily merge your contributings. The PR will need to be modified to add a $comment that "null" is not documented.

[hyperupcall]

@wtchnm I got the go-ahead for this change. I'll merge this once you add a $comment in both cases, saying that the value of null is UNDOCUMENTED (please capitalize UNDOCUMENTED so all undocumented instances are easy to search for). Thanks

[wtchnm]

Thanks @hyperupcall! I added the "$comment" in both cases.

[hyperupcall]

thanks!