Fix bug with split words

[bconnorwhite]

SplitWords seems to have a bug when casing changes from uppercase to lowercase after a separator.

For example, these tests both fail - the type resolves to never:

expectType<SplitWords<'hello WORLD lowercase'>>(['hello', 'WORLD', 'lowercase']);
expectType<SplitWords<'hello WORLD-lowercase'>>(['hello', 'WORLD', 'lowercase']);

Removing the carry over of LastCharacter after a delimiter should fix this

[sindresorhus]

@bconnorwhite Does your changes here and in the other pull request affect any of the exposed types? I'm asking as neither of these types are exported publicly. So not sure whether it needs a new release.

[bconnorwhite]

@sindresorhus

#538

• Fixes some cases where CamelCase would incorrectly resolve to never

#539

• Trim removes all whitespace, not just spaces

[bconnorwhite]

SplitWords (and as a result CamelCase) still doesn't use the full list of whitespace characters added by #539. I've opened a separate PR for it:

#542

• Correctly handles whitespace for change case types