update

node_modules/rxjs/operator/catch.d.ts

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+import { Observable, ObservableInput } from '../Observable';
+/**
+ * Catches errors on the observable to be handled by returning a new observable or throwing an error.
+ *
+ * <img src="./img/catch.png" width="100%">
+ *
+ * @example <caption>Continues with a different Observable when there's an error</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ * 	   if (n == 4) {
+ * 	     throw 'four!';
+ *     }
+ *	   return n;
+ *   })
+ *   .catch(err => Observable.of('I', 'II', 'III', 'IV', 'V'))
+ *   .subscribe(x => console.log(x));
+ *   // 1, 2, 3, I, II, III, IV, V
+ *
+ * @example <caption>Retries the caught source Observable again in case of error, similar to retry() operator</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ * 	   if (n === 4) {
+ * 	     throw 'four!';
+ *     }
+ * 	   return n;
+ *   })
+ *   .catch((err, caught) => caught)
+ *   .take(30)
+ *   .subscribe(x => console.log(x));
+ *   // 1, 2, 3, 1, 2, 3, ...
+ *
+ * @example <caption>Throws a new error when the source Observable throws an error</caption>
+ *
+ * Observable.of(1, 2, 3, 4, 5)
+ *   .map(n => {
+ *     if (n == 4) {
+ *       throw 'four!';
+ *     }
+ *     return n;
+ *   })
+ *   .catch(err => {
+ *     throw 'error in source. Details: ' + err;
+ *   })
+ *   .subscribe(
+ *     x => console.log(x),
+ *     err => console.log(err)
+ *   );
+ *   // 1, 2, 3, error in source. Details: four!
+ *
+ * @param {function} selector a function that takes as arguments `err`, which is the error, and `caught`, which
+ *  is the source observable, in case you'd like to "retry" that observable by returning it again. Whatever observable
+ *  is returned by the `selector` will be used to continue the observable chain.
+ * @return {Observable} An observable that originates from either the source or the observable returned by the
+ *  catch `selector` function.
+ * @method catch
+ * @name catch
+ * @owner Observable
+ */
+export declare function _catch<T, R>(this: Observable<T>, selector: (err: any, caught: Observable<T>) => ObservableInput<R>): Observable<T | R>;