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diff --git a/node_modules/rxjs/dist/esm5/internal/operators/sample.js b/node_modules/rxjs/dist/esm5/internal/operators/sample.js
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+++ b/node_modules/rxjs/dist/esm5/internal/operators/sample.js
@@ -0,0 +1,23 @@
+import { innerFrom } from '../observable/innerFrom';
+import { operate } from '../util/lift';
+import { noop } from '../util/noop';
+import { createOperatorSubscriber } from './OperatorSubscriber';
+export function sample(notifier) {
+    return operate(function (source, subscriber) {
+        var hasValue = false;
+        var lastValue = null;
+        source.subscribe(createOperatorSubscriber(subscriber, function (value) {
+            hasValue = true;
+            lastValue = value;
+        }));
+        innerFrom(notifier).subscribe(createOperatorSubscriber(subscriber, function () {
+            if (hasValue) {
+                hasValue = false;
+                var value = lastValue;
+                lastValue = null;
+                subscriber.next(value);
+            }
+        }, noop));
+    });
+}
+//# sourceMappingURL=sample.js.map
+\ No newline at end of file