Add highlight to @types/theme-ui in colors property

[deadcoder0904]

Is your feature request related to a problem? Please describe.
Can't get autocomplete on highlight property inside colors in theme.ts

Describe the solution you'd like
highlight is missing from the @types/theme-ui package.

Don't know how the contributions work on DefinitelyTyped but as per the docs highlight property is missing in the types. I love the autocompletes guiding me in VSCode.

Also, love theme-ui's thoughtfulness into making all these properties. I don't even have to think which color to add, it's as simple as primary or highlight or muted so thanks to whoever made it :)

[jxnblk]

Theme UI is currently being rewritten in TypeScript, see #668 -- the latest is published with the theme-ui@next tag, if you want to help test it out

[deadcoder0904]

Cool, I'll be testing it as I am using it with Next.js. Should I create new issues related to TypeScript or just comment it at #668?

[hasparus]

Hey @deadcoder0904, I've sent DefinitelyTyped/DefinitelyTyped#45967 and #1058. Would you like to take a look at them?

[deadcoder0904]

LGTM 👍