Fix getRelativePath behaviour on case-insensitive filesystems
#187
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Typically when resolving an import in file `A/a.ts` "from" file `B/b.ts` e.g.
import x from "../B/b"
the function will be called as `getRelativePath("A", "b")`. Note the `"b"` path
has been lowercased by tsc at some point and that `"A"` may not exist on disk
at this point as it's being generated.
The previous logic would fail on `realpathSync.native(from)` because `from =
"A"` does not exist on disk yet and would not fix the casing of `to`. As such
`"../b"` would be returned instead of the correct `"../B"`. The simplest fix is
to swap the realpath calls which is what we do here, as typically `to` will
exist (it's what is being imported) and `from` may not.
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See commit message for explanation. A more elegant solution can likely be devised but this should take care of most cases. Let me know if I should provide more details or a reproducer.