chore(view-cache): [PM-21154] Move view-cache its own feature package and adjust imports

* Moved view-cache services to directory

* Fixed DI for browser extension.

* Fixed tests.

libs/angular/src/platform/view-cache/index.ts

@@ -0,0 +1 @@
+export { ViewCacheService, FormCacheOptions, SignalCacheOptions } from "./view-cache.service";

libs/angular/src/platform/view-cache/internal.ts

@@ -0,0 +1 @@
+export { NoopViewCacheService } from "./noop-view-cache.service";

libs/angular/src/platform/view-cache/noop-view-cache.service.ts

@@ -1,11 +1,7 @@
 import { Injectable, signal, WritableSignal } from "@angular/core";
 import type { FormGroup } from "@angular/forms";
 
-import {
-  FormCacheOptions,
-  SignalCacheOptions,
-  ViewCacheService,
-} from "../abstractions/view-cache.service";
+import { FormCacheOptions, SignalCacheOptions, ViewCacheService } from "./view-cache.service";
 
 /**
  * The functionality of the {@link ViewCacheService} is only needed in the browser extension popup,

libs/angular/src/platform/view-cache/view-cache.md

@@ -0,0 +1,130 @@
+# Extension Persistence
+
+By default, when the browser extension popup closes, the user's current view and any data entered
+without saving is lost. This introduces friction in several workflows within our client, such as:
+
+- Performing actions that require email OTP entry, since the user must navigate from the popup to
+  get to their email inbox
+- Entering information to create a new vault item from a browser tab
+- And many more
+
+Previously, we have recommended that users "pop out" the extension into its own window to persist
+the extension context, but this introduces additional user actions and may leave the extension open
+(and unlocked) for longer than a user intends.
+
+In order to provide a better user experience, we have introduced two levels of persistence to the
+Bitwarden extension client:
+
+- We persist the route history, allowing us to re-open the last route when the popup re-opens, and
+- We offer a service for teams to use to persist component-specific form data or state to survive a
+  popup close/re-open cycle
+
+## Persistence lifetime
+
+Since we are persisting data, it is important that the lifetime of that data be well-understood and
+well-constrained. The cache of route history and form data is cleared when any of the following
+events occur:
+
+- The account is locked
+- The account is logged out
+- Account switching is used to switch the active account
+- The extension popup has been closed for 2 minutes
+
+In addition, cached form data is cleared when a browser extension navigation event occurs (e.g.
+switching between tabs in the extension).
+
+## Types of persistence
+
+### Route history persistence
+
+Route history is persisted on the extension automatically, with no specific implementation required
+on any component.
+
+The persistence layer ensures that the popup will open at the same route as was active when it
+closed, provided that none of the lifetime expiration events have occurred.
+
+:::tip Excluding a route
+
+If a particular route should be excluded from the history and not persisted, add
+`doNotSaveUrl: true` to the `data` property on the route.
+
+:::
+
+### View data persistence
+
+Route persistence ensures that the user will land back on the route that they were on when the popup
+closed, but it does not persist any state or form data that the user may have modified. In order to
+persist that data, the component is responsible for registering that data with the
+[`ViewCacheService`](./view-cache.service.ts).
+This is done prescriptively to ensure that only necessary data is cached and that it is done with
+intention by the component.
+
+The `ViewCacheService` provides an interface for caching both individual state and `FormGroup`s.
+
+#### Caching individual data elements
+
+For individual pieces of state, use the `signal()` method on the `ViewCacheService` to create a
+writeable [signal](https://angular.dev/guide/signals) wrapper around the desired state.
+
+```typescript
+const mySignal = this.viewCacheService.signal({
+    key: "my-state-key"
+    initialValue: null
+});
+```
+
+If a cached value exists, the returned signal will contain the cached data.
+
+Setting the value should be done through the signal's `set()` method:
+
+```typescript
+const mySignal = this.viewCacheService.signal({
+    key: "my-state-key"
+    initialValue: null
+});
+mySignal.set("value")
+```
+
+:::note Equality comparison
+
+By default, signals use `Object.is` to determine equality, and `set()` will only trigger updates if
+the updated value is not equal to the current signal state. See documentation
+[here](https://angular.dev/guide/signals#signal-equality-functions).
+
+:::
+
+Putting this together, the most common implementation pattern would be:
+
+1. **Register the signal** using `ViewCacheService.signal()` on initialization of the component or
+   service responsible for the state being persisted.
+2. **Restore state from the signal:** If cached data exists, the signal will contain that data. The
+   component or service should use this data to re-create the state from prior to the popup closing.
+3. **Set new state** in the cache when it changes. Ensure that any updates to the data are persisted
+   to the cache with `set()`, so that the cache reflects the latest state.
+
+#### Caching form data
+
+For persisting form data, the `ViewCacheService` supplies a `formGroup()` method, which manages the
+persistence of any entered form data to the cache and the initialization of the form from the cached
+data. You can supply the `FormGroup` in the `control` parameter of the method, and the
+`ViewCacheService` will:
+
+- Initialize the form the a cached value, if it exists
+- Save form value to cache when it changes
+- Mark the form dirty if the restored value is not `undefined`.
+
+```typescript
+this.loginDetailsForm = this.viewCacheService.formGroup({
+  key: "my-form",
+  control: this.formBuilder.group({
+    username: [""],
+    email: [""],
+  }),
+});
+```
+
+## What about other clients?
+
+The `ViewCacheService` is designed to be injected into shared, client-agnostic components. A
+`NoopViewCacheService` is provided and injected for non-extension clients, preserving a single
+interface for your components.

libs/angular/src/platform/view-cache/view-cache.service.ts

@@ -42,6 +42,8 @@ export type FormCacheOptions<TFormGroup extends FormGroup> = BaseCacheOptions<
 /**
  * Cache for temporary component state
  *
+ * [Read more](./view-cache.md)
+ *
  * #### Implementations
  * - browser extension popup: used to persist UI between popup open and close
  * - all other clients: noop

libs/angular/src/services/jslib-services.module.ts

@@ -325,13 +325,14 @@ import {
 import { DeviceTrustToastService as DeviceTrustToastServiceAbstraction } from "../auth/services/device-trust-toast.service.abstraction";
 import { DeviceTrustToastService } from "../auth/services/device-trust-toast.service.implementation";
 import { FormValidationErrorsService as FormValidationErrorsServiceAbstraction } from "../platform/abstractions/form-validation-errors.service";
-import { ViewCacheService } from "../platform/abstractions/view-cache.service";
 import { FormValidationErrorsService } from "../platform/services/form-validation-errors.service";
 import { LoggingErrorHandler } from "../platform/services/logging-error-handler";
-import { NoopViewCacheService } from "../platform/services/noop-view-cache.service";
 import { AngularThemingService } from "../platform/services/theming/angular-theming.service";
 import { AbstractThemingService } from "../platform/services/theming/theming.service.abstraction";
 import { safeProvider, SafeProvider } from "../platform/utils/safe-provider";
+import { ViewCacheService } from "../platform/view-cache";
+// eslint-disable-next-line no-restricted-imports -- Needed for DI
+import { NoopViewCacheService } from "../platform/view-cache/internal";
 
 import {
   CLIENT_TYPE,

libs/auth/src/angular/two-factor-auth/child-components/two-factor-auth-email/two-factor-auth-component-email-cache.service.spec.ts

@@ -2,7 +2,7 @@ import { TestBed } from "@angular/core/testing";
 import { mock, MockProxy } from "jest-mock-extended";
 import { BehaviorSubject } from "rxjs";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 

libs/auth/src/angular/two-factor-auth/child-components/two-factor-auth-email/two-factor-auth-email-component-cache.service.spec.ts

@@ -2,7 +2,7 @@ import { TestBed } from "@angular/core/testing";
 import { mock, MockProxy } from "jest-mock-extended";
 import { BehaviorSubject } from "rxjs";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 

libs/auth/src/angular/two-factor-auth/child-components/two-factor-auth-email/two-factor-auth-email-component-cache.service.ts

@@ -1,7 +1,7 @@
 import { inject, Injectable, WritableSignal } from "@angular/core";
 import { Jsonify } from "type-fest";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 

libs/auth/src/angular/two-factor-auth/two-factor-auth-component-cache.service.spec.ts

@@ -2,7 +2,7 @@ import { TestBed } from "@angular/core/testing";
 import { mock, MockProxy } from "jest-mock-extended";
 import { BehaviorSubject } from "rxjs";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { TwoFactorProviderType } from "@bitwarden/common/auth/enums/two-factor-provider-type";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";

libs/auth/src/angular/two-factor-auth/two-factor-auth-component-cache.service.ts

@@ -1,7 +1,7 @@
 import { inject, Injectable, WritableSignal } from "@angular/core";
 import { Jsonify } from "type-fest";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { TwoFactorProviderType } from "@bitwarden/common/auth/enums/two-factor-provider-type";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";

libs/auth/src/common/services/auth-request/default-login-via-auth-request-cache.service.spec.ts

@@ -1,7 +1,7 @@
 import { signal } from "@angular/core";
 import { TestBed } from "@angular/core/testing";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { LoginViaAuthRequestView } from "@bitwarden/common/auth/models/view/login-via-auth-request.view";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 import { Utils } from "@bitwarden/common/platform/misc/utils";

libs/auth/src/common/services/auth-request/default-login-via-auth-request-cache.service.ts

@@ -1,6 +1,6 @@
 import { inject, Injectable, WritableSignal } from "@angular/core";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { LoginViaAuthRequestView } from "@bitwarden/common/auth/models/view/login-via-auth-request.view";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";

libs/vault/src/cipher-form/cipher-form.stories.ts

@@ -13,7 +13,7 @@ import {
 import { BehaviorSubject } from "rxjs";
 
 import { CollectionView } from "@bitwarden/admin-console/common";
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { AuditService } from "@bitwarden/common/abstractions/audit.service";
 import { EventCollectionService } from "@bitwarden/common/abstractions/event/event-collection.service";
 import { Organization } from "@bitwarden/common/admin-console/models/domain/organization";

libs/vault/src/cipher-form/components/cipher-form.component.spec.ts

@@ -3,7 +3,7 @@ import { ComponentFixture, TestBed } from "@angular/core/testing";
 import { ReactiveFormsModule } from "@angular/forms";
 import { mock } from "jest-mock-extended";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 import { I18nService } from "@bitwarden/common/platform/abstractions/i18n.service";
 import { Cipher } from "@bitwarden/common/vault/models/domain/cipher";

libs/vault/src/cipher-form/services/default-cipher-form-cache.service.spec.ts

@@ -1,7 +1,7 @@
 import { signal } from "@angular/core";
 import { TestBed } from "@angular/core/testing";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 import { CipherView } from "@bitwarden/common/vault/models/view/cipher.view";
 

libs/vault/src/cipher-form/services/default-cipher-form-cache.service.ts

@@ -1,6 +1,6 @@
 import { inject, Injectable } from "@angular/core";
 
-import { ViewCacheService } from "@bitwarden/angular/platform/abstractions/view-cache.service";
+import { ViewCacheService } from "@bitwarden/angular/platform/view-cache";
 import { FeatureFlag } from "@bitwarden/common/enums/feature-flag.enum";
 import { ConfigService } from "@bitwarden/common/platform/abstractions/config/config.service";
 import { CipherView } from "@bitwarden/common/vault/models/view/cipher.view";