with-Methods and shared variables

[leomayer]

To my understanding the signalStore provides functionallity to encapsulate specific domain handling - supported by the with-methods. But one downside (or plus - don't know) is that the variables are somehow encapsulated, meaning I cannot access from the signalStoreFeature to the signalStore. Is there a way to achieve it?

I have currently defined a store like this

initSearchState={
  selectedFlightNo: number
  ... // other properties, e.g. paging details
}
export const SearchStore=signalStore(
  withState(initSearchState),
  ...
  withPermissions(),
  ....
}

and the withPermissions feature like

initPermissionState={
  selectedFlightNo: number
... // permission-related properties
}
export function withPermissions(){
  return signalStoreFeature(
    withState(initPermissionState),
    ...
    withMethods((permissionState) => (
    ...
     handOverSearchFlight(selectedFlightNo: number) {
       patchState(permissionState, {selectedFlightNo}
    

My idea is to forward the selectedFlightNo from the store to the encapsulated signalStoreFeature. Right now the above code complains that selectedFlightNo is overridden which sounds somehow strange. Strange in sense of: I cannot access from the feature to the store - so how can they override?

If I change

initPermissionState={
  selectedFlightNo_permission: number
... // permission-related properties
}

no further complaints. But nevertheless it won't solve the initial problem with handover.

[rainerhahnekamp]

You don't add a new state but withPermissions should define that the signalstore which calls it, must have a certain state already:

export function withPermissions(){
  return signalStoreFeature(
    type<{ state: { selectedFlightNo: number } }>(),

     withMethods((permissionState) => (
       handOverSearchFlight(selectedFlightNo: number) {
         patchState(permissionState, {selectedFlightNo}

More info: https://ngrx.io/guide/signals/signal-store/custom-store-features#creating-a-custom-feature-with-input