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+import { not } from '../util/not';
+import { filter } from './filter';
+import { Observable } from '../Observable';
+import { UnaryFunction } from '../types';
+
+/**
+ * Splits the source Observable into two, one with values that satisfy a
+ * predicate, and another with values that don't satisfy the predicate.
+ *
+ * <span class="informal">It's like {@link filter}, but returns two Observables:
+ * one like the output of {@link filter}, and the other with values that did not
+ * pass the condition.</span>
+ *
+ * ![](partition.png)
+ *
+ * `partition` outputs an array with two Observables that partition the values
+ * from the source Observable through the given `predicate` function. The first
+ * Observable in that array emits source values for which the predicate argument
+ * returns true. The second Observable emits source values for which the
+ * predicate returns false. The first behaves like {@link filter} and the second
+ * behaves like {@link filter} with the predicate negated.
+ *
+ * ## Example
+ *
+ * Partition click events into those on DIV elements and those elsewhere
+ *
+ * ```ts
+ * import { fromEvent } from 'rxjs';
+ * import { partition } from 'rxjs/operators';
+ *
+ * const div = document.createElement('div');
+ * div.style.cssText = 'width: 200px; height: 200px; background: #09c;';
+ * document.body.appendChild(div);
+ *
+ * const clicks = fromEvent(document, 'click');
+ * const [clicksOnDivs, clicksElsewhere] = clicks.pipe(partition(ev => (<HTMLElement>ev.target).tagName === 'DIV'));
+ *
+ * clicksOnDivs.subscribe(x => console.log('DIV clicked: ', x));
+ * clicksElsewhere.subscribe(x => console.log('Other clicked: ', x));
+ * ```
+ *
+ * @see {@link filter}
+ *
+ * @param predicate A function that evaluates each value emitted by the source
+ * Observable. If it returns `true`, the value is emitted on the first Observable
+ * in the returned array, if `false` the value is emitted on the second Observable
+ * in the array. The `index` parameter is the number `i` for the i-th source
+ * emission that has happened since the subscription, starting from the number `0`.
+ * @param thisArg An optional argument to determine the value of `this` in the
+ * `predicate` function.
+ * @return A function that returns an array with two Observables: one with
+ * values that passed the predicate, and another with values that did not pass
+ * the predicate.
+ * @deprecated Replaced with the {@link partition} static creation function. Will be removed in v8.
+ */
+export function partition<T>(
+  predicate: (value: T, index: number) => boolean,
+  thisArg?: any
+): UnaryFunction<Observable<T>, [Observable<T>, Observable<T>]> {
+  return (source: Observable<T>) =>
+    [filter(predicate, thisArg)(source), filter(not(predicate, thisArg))(source)] as [Observable<T>, Observable<T>];
+}