♻️ (Navigation) rename instance into singleton

Author: tpucci

src/FullScreenPortal.tsx

@@ -6,7 +6,7 @@ import { Navigation } from './Navigation';
 
 export class FullScreenPortal extends ReactComponent {
   fullScreenStack = fromStream(
-    Navigation.getInstance().fullScreenDelegate.fullSceenStack$
+    Navigation.instance.fullScreenDelegate.fullSceenStack$
   );
 
   render() {

src/Navigation/Navigation.ts

@@ -1,14 +1,14 @@
 import { FullScreenDelegate } from './FullScreenDelegate';
 
 export class Navigation {
-  static getInstance() {
-    if (Navigation.instance) {
-      return Navigation.instance;
+  static get instance() {
+    if (Navigation.singleton) {
+      return Navigation.singleton;
     }
-    Navigation.instance = new Navigation();
-    return Navigation.instance;
+    Navigation.singleton = new Navigation();
+    return Navigation.singleton;
   }
-  private static instance: Navigation;
+  private static singleton: Navigation;
 
   fullScreenDelegate = new FullScreenDelegate();
 }

src/__tests__/Navigation.test.ts

@@ -2,8 +2,8 @@ import { Navigation } from '../Navigation';
 
 describe('Navigation store', () => {
   it('exposes the same store instance if it accessed twice', () => {
-    const navigation = Navigation.getInstance();
-    const otherNavigation = Navigation.getInstance();
+    const navigation = Navigation.instance;
+    const otherNavigation = Navigation.instance;
     expect(otherNavigation).toBe(navigation);
   });
 });

src/createCanal.tsx

@@ -102,7 +102,7 @@ export const createCanal = <
        */
       // @ts-ignore
       this.authorizations$.next(nextAuthorizations);
-      Navigation.getInstance().fullScreenDelegate.canalsFullScreenStackProperties$.next(
+      Navigation.instance.fullScreenDelegate.canalsFullScreenStackProperties$.next(
         this.fullScreenStackProperties$
       );
     }