模块“./datasources”没有导出的成员“DbDataSource”。 环回

Question

I am trying to authenticate a loopback API but I am getting Module '"./datasources"' has no exported member 'DbDataSource'.

In my application.ts I have

import {BootMixin} from '@loopback/boot';
import {RepositoryMixin} from '@loopback/repository';
import {RestApplication, OpenApiBuilder, ServerObject} from '@loopback/rest';
import {ServiceMixin} from '@loopback/service-proxy';
import {MySequence} from './sequence';
import {
  AuthenticationBindings,
  UsersBindings, 
  AssetsBindings,
  SubjectsBindings,
  CoursesBindings
} from './keys';
import {
  AuthenticationService,
  UsersService, 
  AssetsService, 
  CoursesService,
  SubjectsService
} from './services'

import {AuthenticationComponent} from '@loopback/authentication';
import {
  JWTAuthenticationComponent,
  SECURITY_SCHEME_SPEC,
  UserServiceBindings,
} from '@loopback/authentication-jwt';
import {DbDataSource} from './datasources';


export class AtgCodeApplication extends BootMixin(
  ServiceMixin(RepositoryMixin(RestApplication)),
) {
  private static instance: AtgCodeApplication;
  constructor(options: ApplicationConfig = {}) {
    super({
      rest: {
        cors: {}
      }
    });

I am getting Module '"./datasources"' has no exported member 'DbDataSource'. with DbDataSource and also getting Cannot find name 'ApplicationConfig'. and Parameter 'options' of constructor from exported class has or is using private name 'ApplicationConfig'. in ApplicationConfig

I am using the auth procedure in https://loopback.io/doc/en/lb4/Authentication-tutorial.html#step-1-bind-jwt-component-in-the-application as a guild.

How can I fix these errors please.

Answer 1

Your application.ts seems a bit outdated. You might want to check with https://github.com/strongloop/loopback-next/blob/master/examples/todo-jwt/src/application.ts as a reference.

For the DbDataSource issue, it is the DataSource you've created to store the User data. It might be of a different name.

Overall, you can download the latest todo-jwt example by running lb4 example todo-jwt command.