问Angular如何重新初始化单例服务

EN

app.module.ts
@NgModule({
  declarations: [
    AppComponent,
  ],
  imports: [
    BrowserModule,
    BrowserAnimationsModule,
    HttpClientModule,
    FormsModule,
      RouterModule.forRoot([
        { path: '', loadChildren: () => import('./site/site.module').then(u => u.SiteModule) },
        { path: 'designer', loadChildren: () => import('./designer/designer.module').then(u => u.DesignerModule), canActivate: [AuthGuard] },
        { path: 'signin', loadChildren: () => import('./login/signin/signin.module').then(u => u.SigninModule) },
        { path: 'signup', loadChildren: () => import('./login/signup/signup.module').then(u => u.SignupModule) },
    ]),
    BrowserAnimationsModule,
    StoreModule.forRoot(reducers, {
      metaReducers,
      runtimeChecks: {
        strictStateImmutability: true,
        strictActionImmutability: true,
      }
    }),
  ],
  providers: [
    ScriptService,
    ComponentLoadService,
    MessagingService,
    { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true },
    { provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },
  ],
  bootstrap: [AppComponent],
})
export class AppModule { }

designer.module.ts
@NgModule({
  imports: [
    CommonModule,
    RouterModule.forChild([
      { path: ':id', component: DesignerComponent }
    ]),
    AngularSplitModule.forRoot(),
    ...
  ],
  declarations: [
     DesignerComponent,
     DesignerMenuComponent,
     ...
  ]
  providers: [
    ProjectService,
    ...
  ]
})
export class DesignerModule { }

project.service.ts
@Injectable()
export class ProjectService{
   private historyModule: ProjectUndoRedo[] = []; // This value still hold old data after going to another page and coming back. I want this service to be reinitialized
}

designer.component.ts
export class DesignerComponent{
   constructor(public projectService: ProjectService) {
      // When this constructor is called, projectSerivce instance is the old instance.
   }
}

designer-menu.component.ts
export class DesignerMenuComponent{
   constructor(public projectService: ProjectService) {
      // When this constructor is called, projectSerivce instance is the old instance.
   }
}