recoder-code
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text/typescript
/** prettier */
import { Observable } from '../Observable';
import { isFunction } from './isFunction';
/**
* Tests to see if the object is an RxJS {@link Observable}
* @param obj the object to test
*/
export function isObservable(obj: any): obj is Observable<unknown> {
// The !! is to ensure that this publicly exposed function returns
// `false` if something like `null` or `0` is passed.
return !!obj && (obj instanceof Observable || (isFunction(obj.lift) && isFunction(obj.subscribe)));
}