Add Observable.empty; bump to v0.1.2

Author: felipecsl

package.json

@@ -1,6 +1,6 @@
 {
   "name": "obgen",
-  "version": "0.1.1",
+  "version": "0.1.2",
   "description": "Javascript Observables implemented with async generators",
   "main": "dist/observable.js",
   "types": "dist/observable.d.ts",

src/observable.ts

@@ -206,6 +206,11 @@ export default class Observable<T> {
     });
   }
 
+  /** Returns a new empty `Observable`, which emits no items and ends immediately. */
+  static empty<T>(): Observable<T> {
+    return Observable.create((stream) => stream.end());
+  }
+
   /**
    * Creates an `Observable` that, upon subscription, emits the provided value `val` and ends
    * immediately.

src/test/observable.test.ts

@@ -62,6 +62,12 @@ describe("Observable", () => {
       expect(await observable.toArray()).toEqual([[1]]);
     });
   });
+  describe("#empyt", () => {
+    it("should emit no items", async () => {
+      const observable = Observable.empty();
+      expect(await observable.toArray()).toEqual([]);
+    });
+  });
   describe("#defer", () => {
     it("should resolve promise upon subscription", async () => {
       const arr = [1];