Fix linter warnings

api/src/engine/connectors/datashield/main.connector.ts

 import { HttpService } from '@nestjs/axios';
-import { Request } from 'express';
 import { Observable } from 'rxjs';
 import { IEngineOptions, IEngineService } from 'src/engine/engine.interfaces';
 
@@ -13,23 +12,23 @@ export default class DataShieldService implements IEngineService {
     return 'datashield';
   }
 
-  getExperiment(uuid: string): Observable<string> {
+  getExperiment(): Observable<string> {
     throw new Error('Method not implemented.');
   }
 
-  deleteExperiment(uuid: string, request: Request): Observable<string> {
+  deleteExperiment(): Observable<string> {
     throw new Error('Method not implemented.');
   }
 
-  editExperiment(uuid: string, request: Request): Observable<string> {
+  editExperiment(): Observable<string> {
     throw new Error('Method not implemented.');
   }
 
-  startExperimentTransient(request: Request): Observable<string> {
+  startExperimentTransient(): Observable<string> {
     throw new Error('Method not implemented.');
   }
 
-  startExperiment(request: Request): Observable<string> {
+  startExperiment(): Observable<string> {
     throw new Error('Method not implemented.');
   }
 

api/src/engine/models/domain.model.ts

@@ -4,6 +4,6 @@ import { Group } from './group.model';
 
 @ObjectType()
 export class Domain extends Group {
-  @Field((type) => [Category])
+  @Field(() => [Category])
   datasets: Category[];
 }

api/src/engine/models/group.model.ts

@@ -12,9 +12,9 @@ export class Group {
   @Field({ nullable: true })
   description?: string;
 
-  @Field((type) => [Group])
+  @Field(() => [Group])
   groups: Group[];
 
-  @Field((type) => [Variable])
+  @Field(() => [Variable])
   variables: Variable[];
 }

api/src/engine/models/variable.model.ts

@@ -16,9 +16,9 @@ export class Variable {
   @Field({ nullable: true })
   description?: string;
 
-  @Field((type) => [Category])
+  @Field(() => [Category])
   enumerations: Category[];
 
-  @Field((type) => [Group])
+  @Field(() => [Group])
   groups: Group[];
 }

api/src/main/app.controller.ts

-import { HttpService } from '@nestjs/axios';
 import { Controller, Get } from '@nestjs/common';
 import { AppService } from './app.service';