feat!: ignore typingsFile option and deprecate @type pragma

[mrazauskas]

@SimenB Another alternative which would unblock jestjs/jest#12198

This change makes the runner work just like it was in v1.1.0. The typingsFile option always receives a path which exist in the file system and this silences the tsd error: "The type definition [file] does not exist."

This is the same trick which was documented as a workaround (so documentation can be skipped).

This change does not influence tsd's behaviour related with testing type definitions. All type checking works as before. And jestjs/jest#12199 would be unnecessary.

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Not sure I like this solution. Just another workaround. Might be worth to fork tsd, remove all extra checks it does and to use that fork. Simply a library which does one task – tests types.

I have a draft already. Just wanted to check if it is worth the efforts?

[mrazauskas]

Forked tsd-lite is the cleanest solution I could come up. See https://github.com/mrazauskas/tsd-lite

No need for any workarounds. Also it is lighter, because I removed unnecessary CLI and few other dependencies.

The code is finished. Just leaving it for cool down. Will take another look tomorrow and will publish it.