Required properties are typed as optional in useMachine input

[iyefrat]

🐛 Bug report

It seems that all properties in useMachine input are typed as optional, even if they are required in the documentation and in practice. This causes code that typechecks to fail in runtime.

💥 Steps to reproduce

1. Create a splitter without a panels input
2. see that it typechecks tsc -b
3. see that the website doesn't load, and that the console log shows [zag-js] missing required props: panels
4. add panels and see that it solves the issue.

💻 Link to reproduction

https://stackblitz.com/edit/sb1-3xdwzhmb?file=src%2FApp.tsx

🧐 Expected behavior

Since panels are a required property I would expect this to fail type checking.

🧭 Possible Solution

It seems that the input is partial'd on purpose, see

zag/packages/frameworks/solid/src/machine.ts

Line 22 in 4899e1d

userProps: Partial<T["props"]> | Accessor<Partial<T["props"]>> = {},

I'm not sure why that is, but maybe it's possible to remove that and do something else instead.

🌍 System information

Software	Version(s)
Zag Version	1.9.3
Browser	Chrome 134.0.6998.166
Operating System	MacOS 15.3.2

📝 Additional information