Angular 5 connect postgreSQL

I think you need to split your code into at least three files:

config.js

import {Sequelize} from '@angular/sequelize';
const Sequelize = require('sequelize'); 
const sequelize = new Sequelize('postgres://localhost:5432/neme_database');

export sequlize

in you index.js you import your config and connect to database

import { sequlize } from 'path-to-config/config.js`

sequelize.authenticate().then(() => {
 console.log('Connection has been established successfully.');
})
.catch(err => {
  console.error('Unable to connect to the database:', err);
});

user models models/user.js

export const UserLogin = sequelize.define('user', {
  userName: {
    type: Sequelize.TEXT
  },
  password: {
    type: Sequelize.TEXT
  },
});

Then in your controller inside function such as

getAllUser() {
  return UserLogin.findAll()
}

Code now has the following structure:

- app
 -- auth
  --- auth.quard.ts
  --- auth.service.ts
  --- user.ts
 - home
  --- home.component.html
  --- home.component.ts
 - login  
  --- login.component.html
  --- login.component.ts
 - models
  --- UserLogin.js
 - app.routing.models.ts
 - app.components.ts
 - app.components.html
 - app.models.ts
 - config.js
 - index.js

Should I install to connect to the database?

        npm install express --save       
        npm install passport --save          
        npm install passport-local --save            
        npm install body-parser --save           
        npm install express-session --save           
        npm install bcrypt-nodejs --save             
        npm install express-handlebars --save

I put the getAllUser method in auth / auth.service.ts

import { Injectable } from '@angular/core';
import { Router } from '@angular/router';
import { BehaviorSubject } from 'rxjs/BehaviorSubject';
import { User } from './user';
import {UserLogin}  from './models/userLogin.js';


@Injectable()

export class AuthService {

  private loggedIn = new BehaviorSubject<boolean>(false);   

  get isLoggedIn() {
    return this.loggedIn.asObservable();
  }

  constructor(
    private router: Router
  ) {}

  login(user: User) {
    if (user.userName !== '' && user.password !== '' )  {
      this.loggedIn.next(true);       
      this.router.navigate(['/']);
    }
  }

  getAllUser() {
   return UserLogin.findAll();
  }
}

but it returns an error message:

 Failed to compile.

./src/app/auth/auth.service.ts
Module not found: Error: Can't resolve './models/userLogin.js' in 
'C:\myPath\name_project\src\app\auth'
@ ./src/app/auth/auth.service.ts 15:21-53
@ ./src/app/app.module.ts
@ ./src/main.ts
@ multi webpack-dev-server/client?http://0.0.0.0:0 ./src/main.ts

app/models/userLogin.js:

    const UserLogin = sequelize.define('user', {
        userName: {
            type: Sequelize.STRING
          },
        password: {
            type: Sequelize.STRING
          },
    });


    UserLogin.findAll().then(users => {
          console.log(users)
        });