tree shaking support for services (#3906)

[ADF-3697] tree shaking support for services

lib/core/form/services/activiti-alfresco.service.ts

@@ -24,7 +24,9 @@ import { ExternalContent } from '../components/widgets/core/external-content';
 import { ExternalContentLink } from '../components/widgets/core/external-content-link';
 import { map, catchError } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class ActivitiContentService {
 
     static UNKNOWN_ERROR_MESSAGE: string = 'Unknown error';

lib/core/form/services/ecm-model.service.ts

@@ -22,7 +22,9 @@ import { Observable, from } from 'rxjs';
 import { FormModel } from '../components/widgets/core/form.model';
 import { map, catchError } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class EcmModelService {
 
     public static MODEL_NAMESPACE: string = 'activitiForms';

lib/core/form/services/form-rendering.service.ts

@@ -40,7 +40,9 @@ import {
     DateTimeWidgetComponent
 } from './../components/widgets/index';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class FormRenderingService extends DynamicComponentMapper {
 
     protected defaultValue: Type<{}> = UnknownWidgetComponent;

lib/core/form/services/form.service.ts

@@ -31,7 +31,9 @@ import {
 import { EcmModelService } from './ecm-model.service';
 import { map, catchError, switchMap, combineAll, defaultIfEmpty } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class FormService {
 
     static UNKNOWN_ERROR_MESSAGE: string = 'Unknown error';

lib/core/form/services/node.service.ts

@@ -21,7 +21,9 @@ import { Observable, from } from 'rxjs';
 import { NodeMetadata } from '../models/node-metadata.model';
 import { map } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class NodeService {
 
     constructor(private apiService: AlfrescoApiService) {

lib/core/form/services/process-content.service.ts

@@ -22,7 +22,9 @@ import { RelatedContentRepresentation } from 'alfresco-js-api';
 import { Observable, from, throwError } from 'rxjs';
 import { catchError } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class ProcessContentService {
 
     static UNKNOWN_ERROR_MESSAGE: string = 'Unknown error';

lib/core/form/services/widget-visibility.service.ts

@@ -25,7 +25,9 @@ import { TaskProcessVariableModel } from '../models/task-process-variable.model'
 import { WidgetVisibilityModel } from '../models/widget-visibility.model';
 import { map, catchError } from 'rxjs/operators';
 
-@Injectable()
+@Injectable({
+    providedIn: 'root'
+})
 export class WidgetVisibilityService {
 
     private processVarList: TaskProcessVariableModel[];