expect-type should allow tsconfig options from new versions of typescript

[sandersn]

Example: exactOptionalPropertyTypes only works in 4.4, but it should be required in all tsconfigs on DT even though older compilers won't recognise it.
expect-type should remove new flags from tsconfig when testing old versions.

[sokarax]

Example: exactOptionalPropertyTypes only works in 4.4, but it should be required in all tsconfigs on DT even though older compilers won't recognise it.

expect-type should remove new flags from tsconfig when testing old versions.

Remove

[OliverJAsh]

Note this is preventing me from writing a test for DefinitelyTyped/DefinitelyTyped#57463.

[sandersn]

This is my DT duty week and this is on my list to fix. So maybe I'll have a fix soon!

[sandersn]

@OliverJAsh I just published a new version of DefinitelyTyped-tools, so it should be available for DT PRs in a few minutes.