Function isDataSource

src/cdk/collections/data-source.ts:34–40

(value: any)

/** Checks whether an object is a data source. */
export function isDataSource(value: any): value is DataSource<any> {
  // Check if the value is a DataSource by observing if it has a connect function. Cannot
  // be checked as an `instanceof DataSource` since people could create their own sources
  // that match the interface, but don't extend DataSource. We also can't use `isObservable`
  // here, because of some internal apps.
  return value && typeof value.connect === 'function' && !(value instanceof ConnectableObservable);
}