Function refresh

refresh<T>(): OperatorFunction<T | null | undefined, T | undefined>
Returns an RxJS operator to refresh a Resource or Collection of resources. It is equivalent to
```
switchMap(resource => of(undefined))
```
if resource is null or undefined and to
```
switchMap(resource => resource.read())
```
otherwise.
Type Parameters
- T extends Resource
Returns OperatorFunction<T | null | undefined, T | undefined>
a function that transforms the source Observable
- Defined in src/lib/rxjs.ts:121

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