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node_modules/rxjs/_esm2015/operator/do.js

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+import { tap as higherOrder } from '../operators/tap';
+/* tslint:enable:max-line-length */
+/**
+ * Perform a side effect for every emission on the source Observable, but return
+ * an Observable that is identical to the source.
+ *
+ * <span class="informal">Intercepts each emission on the source and runs a
+ * function, but returns an output which is identical to the source as long as errors don't occur.</span>
+ *
+ * <img src="./img/do.png" width="100%">
+ *
+ * Returns a mirrored Observable of the source Observable, but modified so that
+ * the provided Observer is called to perform a side effect for every value,
+ * error, and completion emitted by the source. Any errors that are thrown in
+ * the aforementioned Observer or handlers are safely sent down the error path
+ * of the output Observable.
+ *
+ * This operator is useful for debugging your Observables for the correct values
+ * or performing other side effects.
+ *
+ * Note: this is different to a `subscribe` on the Observable. If the Observable
+ * returned by `do` is not subscribed, the side effects specified by the
+ * Observer will never happen. `do` therefore simply spies on existing
+ * execution, it does not trigger an execution to happen like `subscribe` does.
+ *
+ * @example <caption>Map every click to the clientX position of that click, while also logging the click event</caption>
+ * var clicks = Rx.Observable.fromEvent(document, 'click');
+ * var positions = clicks
+ *   .do(ev => console.log(ev))
+ *   .map(ev => ev.clientX);
+ * positions.subscribe(x => console.log(x));
+ *
+ * @see {@link map}
+ * @see {@link subscribe}
+ *
+ * @param {Observer|function} [nextOrObserver] A normal Observer object or a
+ * callback for `next`.
+ * @param {function} [error] Callback for errors in the source.
+ * @param {function} [complete] Callback for the completion of the source.
+ * @return {Observable} An Observable identical to the source, but runs the
+ * specified Observer or callback(s) for each item.
+ * @method do
+ * @name do
+ * @owner Observable
+ */
+export function _do(nextOrObserver, error, complete) {
+    return higherOrder(nextOrObserver, error, complete)(this);
+}
+//# sourceMappingURL=do.js.map