initial commit: scaffolding

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+import { MonoTypeOperatorFunction } from '../types';
+import { EMPTY } from '../observable/empty';
+import { operate } from '../util/lift';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+
+/**
+ * Emits only the first `count` values emitted by the source Observable.
+ *
+ * <span class="informal">Takes the first `count` values from the source, then
+ * completes.</span>
+ *
+ * ![](take.png)
+ *
+ * `take` returns an Observable that emits only the first `count` values emitted
+ * by the source Observable. If the source emits fewer than `count` values then
+ * all of its values are emitted. After that, it completes, regardless if the
+ * source completes.
+ *
+ * ## Example
+ *
+ * Take the first 5 seconds of an infinite 1-second interval Observable
+ *
+ * ```ts
+ * import { interval, take } from 'rxjs';
+ *
+ * const intervalCount = interval(1000);
+ * const takeFive = intervalCount.pipe(take(5));
+ * takeFive.subscribe(x => console.log(x));
+ *
+ * // Logs:
+ * // 0
+ * // 1
+ * // 2
+ * // 3
+ * // 4
+ * ```
+ *
+ * @see {@link takeLast}
+ * @see {@link takeUntil}
+ * @see {@link takeWhile}
+ * @see {@link skip}
+ *
+ * @param count The maximum number of `next` values to emit.
+ * @return A function that returns an Observable that emits only the first
+ * `count` values emitted by the source Observable, or all of the values from
+ * the source if the source emits fewer than `count` values.
+ */
+export function take<T>(count: number): MonoTypeOperatorFunction<T> {
+  return count <= 0
+    ? // If we are taking no values, that's empty.
+      () => EMPTY
+    : operate((source, subscriber) => {
+        let seen = 0;
+        source.subscribe(
+          createOperatorSubscriber(subscriber, (value) => {
+            // Increment the number of values we have seen,
+            // then check it against the allowed count to see
+            // if we are still letting values through.
+            if (++seen <= count) {
+              subscriber.next(value);
+              // If we have met or passed our allowed count,
+              // we need to complete. We have to do <= here,
+              // because re-entrant code will increment `seen` twice.
+              if (count <= seen) {
+                subscriber.complete();
+              }
+            }
+          })
+        );
+      });
+}