diff --git a/frontend/app/components/api/api-v3/hal-resources/work-package-resource.service.ts b/frontend/app/components/api/api-v3/hal-resources/work-package-resource.service.ts
index 6377e9b10d..52ce4a8e52 100644
--- a/frontend/app/components/api/api-v3/hal-resources/work-package-resource.service.ts
+++ b/frontend/app/components/api/api-v3/hal-resources/work-package-resource.service.ts
@@ -69,7 +69,7 @@ export default class WorkPackageResource extends HalResource {
     return !this[fieldName] && fieldSchema.writable && fieldSchema.required;
   }
 
-  public allowedValuesFor(field):ng.IPromise<op.HalResource[]> {
+  public allowedValuesFor(field):ng.IPromise<HalResource[]> {
     var deferred = $q.defer();
     this.getForm().then(form => {
       const allowedValues = form.$embedded.schema[field].allowedValues;
@@ -149,10 +149,11 @@ export default class WorkPackageResource extends HalResource {
             angular.extend(this, workPackage);
             wpCacheService.updateWorkPackageList([this]);
             deferred.resolve(this);
-          }).catch((error) => {
+          })
+          .catch((error) => {
             deferred.reject(error);
-          }).finally(() => {
-
+          })
+          .finally(() => {
             // Restore the form for subsequent saves
             // e.g., due to changes in lockVersion.
             // Not needed for inline create.
@@ -170,8 +171,7 @@ export default class WorkPackageResource extends HalResource {
   }
 
   public isParentOf(otherWorkPackage) {
-    return otherWorkPackage.parent.$links.self.$link.href ===
-      this.$links.self.$link.href;
+    return otherWorkPackage.parent.$links.self.$link.href === this.$links.self.$link.href;
   }
 
   public get isEditable():boolean {
@@ -181,9 +181,9 @@ export default class WorkPackageResource extends HalResource {
   protected saveResource(payload):ng.IPromise<any> {
     if (this.isNew) {
       return apiWorkPackages.wpApiPath().post(payload);
-    } else {
-      return this.$links.updateImmediately(payload);
     }
+
+    return this.$links.updateImmediately(payload);
   }
 }
 
diff --git a/frontend/app/components/api/api-work-packages/api-work-packages.service.ts b/frontend/app/components/api/api-work-packages/api-work-packages.service.ts
index 1109fc120f..162469a09b 100644
--- a/frontend/app/components/api/api-work-packages/api-work-packages.service.ts
+++ b/frontend/app/components/api/api-work-packages/api-work-packages.service.ts
@@ -26,13 +26,15 @@
 // See doc/COPYRIGHT.rdoc for more details.
 //++
 
+import HalResource from '../api-v3/hal-resources/hal-resource.service';
+
 export class ApiWorkPackagesService {
   protected wpBaseApi;
 
-  constructor (protected DEFAULT_PAGINATION_OPTIONS,
-               protected $stateParams,
-               protected $q:ng.IQService,
-               protected apiV3:restangular.IService) {
+  constructor(protected DEFAULT_PAGINATION_OPTIONS,
+              protected $stateParams,
+              protected $q:ng.IQService,
+              protected apiV3:restangular.IService) {
 
     this.wpBaseApi = apiV3.service('work_packages');
   }
@@ -41,10 +43,7 @@ export class ApiWorkPackagesService {
     var workPackages = this.wpApiPath(query.projectId);
 
     return workPackages.getList(
-      this.queryAsV3Params(offset, pageSize, query),
-      {
-        caching: { enabled : false }
-      }
+      this.queryAsV3Params(offset, pageSize, query), {caching: {enabled: false}}
     );
   }
 
@@ -53,23 +52,25 @@ export class ApiWorkPackagesService {
    *
    * @returns An empty work package form resource.
    */
-  public emptyCreateForm(projectIdentifier?:string):ng.IPromise<op.HalResource> {
+  public emptyCreateForm(projectIdentifier?:string):ng.IPromise<HalResource> {
     return this.wpApiPath(projectIdentifier).one('form').customPOST();
   }
 
   /**
    * Returns a promise to GET `/api/v3/work_packages/available_projects`.
    */
-  public availableProjects(projectIdentifier?:string):ng.IPromise<op.HalResource> {
+  public availableProjects(projectIdentifier?:string):ng.IPromise<HalResource> {
     return this.wpApiPath(projectIdentifier).one('available_projects').get();
   }
 
-  public wpApiPath(projectIdentifier?: any) {
+  public wpApiPath(projectIdentifier?:any) {
+    const args = ['work_packages'];
+
     if (!!projectIdentifier) {
-      return this.apiV3.service('work_packages', this.apiV3.one('projects', projectIdentifier));
-    } else {
-      return this.apiV3.service('work_packages');
+      args.push(this.apiV3.one('projects', projectIdentifier));
     }
+    
+    return this.apiV3.service(...args);
   }
 
   protected queryAsV3Params(offset:number, pageSize:number, query:api.ex.Query) {
diff --git a/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.module.ts b/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.module.ts
index 3d60c9f178..54f7275906 100644
--- a/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.module.ts
+++ b/frontend/app/components/wp-edit/wp-edit-field/wp-edit-field.module.ts
@@ -26,6 +26,8 @@
 // See doc/COPYRIGHT.rdoc for more details.
 // ++
 
+import HalResource from '../../api/api-v3/hal-resources/hal-resource.service';
+
 export class Field {
   public static type:string;
   public static $injector:ng.auto.IInjectorService;
@@ -42,7 +44,7 @@ export class Field {
     return (this.constructor as typeof Field).$injector;
   }
 
-  constructor(public resource:op.HalResource,
+  constructor(public resource:HalResource,
               public name:string,
               public schema) {
   }
@@ -53,14 +55,14 @@ export class FieldFactory {
 
   protected static fields = {};
 
-  protected static classes: {[type:string]: typeof Field} = {};
+  protected static classes:{[type:string]:typeof Field} = {};
 
-  public static register(fieldClass: typeof Field, fields:string[] = []) {
+  public static register(fieldClass:typeof Field, fields:string[] = []) {
     fields.forEach(field => FieldFactory.fields[field] = fieldClass.type);
     FieldFactory.classes[fieldClass.type] = fieldClass;
   }
 
-  public static create(workPackage:op.HalResource,
+  public static create(workPackage:HalResource,
                        fieldName:string,
                        schema:op.FieldSchema):Field {
     let type = FieldFactory.getType(schema.type);
diff --git a/frontend/app/typings/open-project.typings.ts b/frontend/app/typings/open-project.typings.ts
index 63079a8cb0..c58127e046 100644
--- a/frontend/app/typings/open-project.typings.ts
+++ b/frontend/app/typings/open-project.typings.ts
@@ -197,18 +197,6 @@ declare namespace op {
     restangularized:boolean;
   }
 
-  class HalResource {
-    public $links;
-    public $embedded;
-    public $isHal;
-    public name:string;
-    public href:string;
-
-    constructor($source: restangular.IElement, $loaded: boolean);
-
-    public $plain();
-  }
-
   class HalLink {
     public href:string;
     public title:string;
@@ -227,7 +215,6 @@ declare namespace op {
   }
 
   interface WorkPackage extends api.v3.WorkPackage, WorkPackageLinks {
-
     getForm();
     getSchema();