Remove If* types in favour of a single If type

[som-sm]

Completes point no. 16 of #450.

Removes all If* types (IfAny, IfNever, IfUnknown, IfNull & IfEmptyObject) in favour of a single If type as suggested here.

NOTE:

• I have kept the IfNotAnyOrNever type because I feel it's still a nice abstraction as it handles two checks, and the defaults of any and never are mostly useful.

[sindresorhus]

I have kept the IfNotAnyOrNever type because I feel it's still a nice abstraction as it handles two checks, and the defaults of any and never are mostly useful.

👍

[sindresorhus]

I think it would be nice to just keep alias to the existing If* types using the If type with a deprecated doc comment, in index.d.ts. That would make it easier for people to migrate.

type IfAny<T, ...> = If<IsAny<T>, ...>;

[sindresorhus]

The deprecated comment could say it will be removed in the next major version.

[som-sm]

I think it would be nice to just keep alias to the existing If* types using the If type with a deprecated doc comment, in index.d.ts. That would make it easier for people to migrate.

Yeah, I too thought so, will update the PR.

[som-sm]

Note: The {@link If} link is still not clickable, because If is not imported in this file.

And this happens at many places (like the @see {@link IsAny} link), I'll look into this separately.

[som-sm]

Updated the PR to just deprecate the If* types.

Properly gets flagged while importing these types: