Type issue with $select

This is a...

[ ] feature request
[x] bug report
[ ] usage question

What toolchain are you using for transpilation/bundling?

[x] @angular/cli
[ ] Custom @ngTools/webpack
[ ] Raw ngc
[ ] SystemJS
[ ] Rollup
[ ] Other

Environment

NodeJS Version: 8 Typescript Version: 2.8 Angular Version: 6.0.3 @angular-redux/store version: ^9.0.0 OS: High Sierra

Expected Behaviour:

Given the following code:

const selector = (state: RootState): boolean => state.users.isSaving 
export class Users {
   ...

  @select$(
    selector,
    isSaving$ => isSaving$.pipe(map(isSaving => isSaving ? 'Saving…' : 'Save')),
  )
  saveButtonText$: Observable<string>;

saveButtonText$ should be an Observable<string>

Actual Behaviour:

It errors out when map(isSaving => isSaving ? 'Saving…' : 'Save') maps from Observable<boolean> to Observable<string>.

Additional Notes:

https://github.com/angular-redux/store/blob/master/src/decorators/select.ts#L62

off hand this should be something like

export function select$<T, A>(
  selector: Selector<any, T>,
  transformer: Transformer<T, A>,
  comparator?: Comparator
): PropertyDecorator {
  return decorate(selector, transformer, comparator);
}

angular-redux / store

Type issue with $select #541