initial commit: scaffolding

1 files changed, 13 insertions, 0 deletions

diff --git a/node_modules/rxjs/src/internal/util/isObservable.ts b/node_modules/rxjs/src/internal/util/isObservable.ts
new file mode 100644
index 0000000..8df8f32
--- /dev/null
+++ b/node_modules/rxjs/src/internal/util/isObservable.ts
@@ -0,0 +1,13 @@
+/** prettier */
+import { Observable } from '../Observable';
+import { isFunction } from './isFunction';
+
+/**
+ * Tests to see if the object is an RxJS {@link Observable}
+ * @param obj the object to test
+ */
+export function isObservable(obj: any): obj is Observable<unknown> {
+  // The !! is to ensure that this publicly exposed function returns
+  // `false` if something like `null` or `0` is passed.
+  return !!obj && (obj instanceof Observable || (isFunction(obj.lift) && isFunction(obj.subscribe)));
+}