RFC(`@ngrx/signals`): Add `withProps` feature about platform HOT 6 OPEN

I updated the RFC description with more details:

• The withProps factory function would accept previously defined state signals, computed signals, and properties.
• withComputed, withMethods, and withHooks would accept previously defined properties.

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This would be useful!

Can props be private the same way state/computed/methods are?

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Yes, that would be an addition, we definitely should have. Just two questions:

• Do we now have constraints for the property type, or can it be anything?
• You stated that the factory function gets the existing slices and computeds. I guess it would also get the previous props? Why do we not pass the methods as well?

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As suggested something like this last week on discord when talking with @rainerhahnekamp. It would be super useful to open many new capabilities and to avoid hacks with Proxy applied on method in withMethods.

Are there any more details about limitations and where those props would be exposed? I'm hopping to have access to them in withComputed.

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IMO it makes a lot of sense when integrating with libs/things from outside of angular ecosystem, which don't fit any of existing withState, withComputed etc.

The only thing which bothers me is the name - withProps. The "property" word doesn't outline what is the key here - being static. How about withStatic?

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@ducin thats why I also proposed alternative name withExplicit

Edited: Ahhh it was in other discussion

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