Convert @emotion/primitives-core to TypeScript

[srmagura]

Part of #2358.

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Latest commit: 2c00874

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[codecov]

Codecov Report

Merging #2818 (2c00874) into ts-migration (945169b) will increase coverage by 0.00%.
The diff coverage is 100.00%.

Impacted Files	Coverage Δ
packages/primitives-core/src/css.ts	100.00% <100.00%> (ø)
packages/primitives-core/src/styled.ts	100.00% <100.00%> (ø)
packages/primitives-core/src/utils.ts	100.00% <100.00%> (ø)

[Andarist]

Hmm, it's an interesting constraint. I can't say that I fully understand why it is written like this. I guess this will be OK or we'll just learn that it's not when converting @emotion/native and stuff 🤷‍♂️

[srmagura]

Should be good now 🙂