Answer:39 injection token

apps/angular/39-injection-token/src/app/data.ts

@@ -1 +1,8 @@
-export const DEFAULT_TIMER = 1000;
+import { InjectionToken, ValueProvider } from '@angular/core';
+
+export const TIMER = new InjectionToken<number>('default-timer');
+
+export const getDefaultTimerProvider = (seconds = 1): ValueProvider => ({
+  provide: TIMER,
+  useValue: 1000 * seconds,
+});

apps/angular/39-injection-token/src/app/phone.component.ts

@@ -1,10 +1,12 @@
 import { Component } from '@angular/core';
+import { getDefaultTimerProvider } from './data';
 import { TimerContainerComponent } from './timer-container.component';
 
 @Component({
   selector: 'app-phone',
   standalone: true,
   imports: [TimerContainerComponent],
+  providers: [getDefaultTimerProvider(2)],
   template: `
     <div class="flex gap-2">
       Phone Call Timer:

apps/angular/39-injection-token/src/app/timer-container.component.ts

@@ -1,5 +1,5 @@
-import { Component } from '@angular/core';
-import { DEFAULT_TIMER } from './data';
+import { Component, inject } from '@angular/core';
+import { TIMER } from './data';
 import { TimerComponent } from './timer.component';
 @Component({
   selector: 'timer-container',
@@ -17,5 +17,5 @@ import { TimerComponent } from './timer.component';
   },
 })
 export class TimerContainerComponent {
-  timer = DEFAULT_TIMER;
+  timer = inject(TIMER);
 }

apps/angular/39-injection-token/src/app/timer.component.ts

@@ -1,15 +1,16 @@
-import { Component } from '@angular/core';
+import { Component, inject } from '@angular/core';
 import { toSignal } from '@angular/core/rxjs-interop';
 import { interval } from 'rxjs';
-import { DEFAULT_TIMER } from './data';
+import { TIMER } from './data';
 
 @Component({
   selector: 'timer',
   standalone: true,
   template: `
-    Timer running {{ timer() }}
+    Timer running {{ timerRunning() }}
   `,
 })
 export class TimerComponent {
-  timer = toSignal(interval(DEFAULT_TIMER));
+  timer = inject(TIMER);
+  timerRunning = toSignal(interval(inject(TIMER)));
 }

apps/angular/39-injection-token/src/app/video.component.ts

@@ -1,10 +1,12 @@
 import { Component } from '@angular/core';
+import { getDefaultTimerProvider } from './data';
 import { TimerContainerComponent } from './timer-container.component';
 
 @Component({
   selector: 'app-video',
   standalone: true,
   imports: [TimerContainerComponent],
+  providers: [getDefaultTimerProvider(1)],
   template: `
     <div class="flex gap-2">
       Video Call Timer: