delete username usecase

src/modules/authentication/core/domain/events/username-deleted.domain-event.ts

@@ -0,0 +1,7 @@
+import { DomainEvent, DomainEventProps } from '@mobicoop/ddd-library';
+
+export class UsernameDeletedDomainEvent extends DomainEvent {
+  constructor(props: DomainEventProps<UsernameDeletedDomainEvent>) {
+    super(props);
+  }
+}

src/modules/authentication/core/domain/username.entity.ts

@@ -1,6 +1,7 @@
 import { AggregateID, AggregateRoot } from '@mobicoop/ddd-library';
 import { CreateUsernameProps, UsernameProps } from './username.types';
 import { UsernameAddedDomainEvent } from './events/username-added.domain-event';
+import { UsernameDeletedDomainEvent } from './events/username-deleted.domain-event';
 
 export class UsernameEntity extends AggregateRoot<UsernameProps> {
   protected readonly _id: AggregateID;
@@ -23,6 +24,14 @@ export class UsernameEntity extends AggregateRoot<UsernameProps> {
     return username;
   };
 
+  delete(): void {
+    this.addEvent(
+      new UsernameDeletedDomainEvent({
+        aggregateId: this.id,
+      }),
+    );
+  }
+
   validate(): void {
     // entity business rules validation to protect it's invariant before saving entity to a database
   }