How to create signalStoreFeature similar to withComputed

[gmfun]

I want to create a signalStoreFeature similar to withComputed which works like bellow

function withApiTableSource((store: WhatShouldThisBe): TableConfig) {
  return signalStoreFeature(
     withMethods(...),
     withComputed(...),
     withHooks()
  )
}

//usage
const store = signalStore(
  withState({a: 1}),
  withApiTableSource((store) => {
    // store.a should be Signal<number>
  })
)

withApiTableSource takes a function as an argument and the argument of this function is store, same store that is passed when I use withComputed((store: THIS) => ...) function.

I see in the sourcecode of withComputed it something like bellow

export function withComputed<
  Input extends SignalStoreFeatureResult,
  Signals extends SignalsDictionary
>(
  signalsFactory: (
    store: Prettify<SignalStoreSlices<Input['state']> & Input['signals']>
  ) => Signals
)

But SignalStoreFeatureResult, Prettify, SignalStoreSlices etc are not exposed from the library.

[rainerhahnekamp]

That's not that easy. The store has pre-defined properties or "slots", where you can only add methods, computed, state or hooks. withComputed, withMethods, etc. have access to the internals, whereas signalStoreFeature is meant for us mortals ;)

Could you please post the full usage of withApiTableSource? Maybe I can help you if I see what is inside withTableSource and what the final properties of the store should look like.

[markostanimirovic]

This is possible, but not provided out of the box via signalStoreFeature function.

You need to 'manually' create a feature similar to base features, for example: https://github.com/ngrx/platform/blob/main/modules/signals/src/with-methods.ts