Remove defaultProps copy

[oliviertassinari]

Current behavior:

emotion/packages/styled/src/base.js

Line 183 in 73f6881

Styled.defaultProps = tag.defaultProps

Expected behavior:

No copy.

Context

React 19 is removing this prop, https://react.dev/blog/2024/04/25/react-19-upgrade-guide#removed-proptypes-and-defaultprops since it was deprecated 5 years ago: facebook/react#16210.

I think that at one point, we will want to remove this line to save bundle size and avoid confusion like in mui/mui-x#11531.

Environment information:

• react version:
• @emotion/react version:

[Andarist]

We have to plan to do this in the next major version that will only be compatible with React 19 (at least that's my current line of thinking about this).

[oliviertassinari]

It's a detail, I would personally not rush it. I mostly wanted to have a place to document this likely future change.