Published: June 22 2019

Angular 8 - JWT Authentication Example & Tutorial

Tutorial built with Angular 8.0.2 and the Angular CLI

Other versions available:

The following is a custom example and tutorial on how to setup a simple login page using Angular 8 and JWT authentication.

For an extended example that includes the use of refresh tokens see Angular 9 - JWT Authentication with Refresh Tokens.

Angular CLI was used to generate the base project structure with the ng new <project name> command, the CLI is also used to build and serve the application. For more info about the Angular CLI see

Styling of the example app is all done with Bootstrap 4.3, for more info about Bootstrap see

The tutorial code is available on GitHub at

Here it is in action: (See on StackBlitz at

Running the Angular 8 JWT Login Tutorial Example Locally

  1. Install NodeJS and NPM from
  2. Download or clone the tutorial project source code from
  3. Install all required npm packages by running npm install from the command line in the project root folder (where the package.json is located).
  4. Start the application by running npm start from the command line in the project root folder, this will build the application and automatically launch it in the browser on the URL http://localhost:4200.

NOTE: You can also run the app directly using the Angular CLI command ng serve --open. To do this first install the Angular CLI globally on your system with the command npm install -g @angular/cli.

For more info on setting up an Angular development environment see Angular - Setup Development Environment.

Running the Tutorial Example with a Real Backend API

The Angular 8 JWT example app uses a fake / mock backend by default so it can run in the browser without a real api, to switch to a real backend api you just have to remove or comment out the line below the comment // provider used to create fake backend located in the /src/app/app.module.ts file.

You can build your own backend api or start with one of the below options:

Angular 8 Tutorial Project Structure

The app and code structure of the tutorial mostly follows the best practice recommendations in the official Angular Style Guide, with a few of my own tweaks here and there.

Each feature has it's own folder (home & login), other shared/common code such as services, models, helpers etc are placed in folders prefixed with an underscore _ to easily differentiate them and group them together at the top of the folder structure.

The index.ts files in each folder are barrel files that group the exported modules from a folder together so they can be imported using the folder path instead of the full module path and to enable importing multiple modules in a single import (e.g. import { AuthenticationService, UserService } from '../_services').

Path aliases @app and @environments have been configured in tsconfig.json that map to the /src/app and /src/environments directories. This allows imports to be relative to the app and environments folders by prefixing import paths with aliases instead of having to use long relative paths (e.g. import MyComponent from '../../../MyComponent').

Here are the main project files that contain the application logic, I left out some files that were generated by Angular CLI ng new command that I didn't change.


Auth Guard

Path: /src/app/_helpers/auth.guard.ts

The auth guard is an angular route guard that's used to prevent unauthenticated users from accessing restricted routes, it does this by implementing the CanActivate interface which allows the guard to decide if a route can be activated with the canActivate() method. If the method returns true the route is activated (allowed to proceed), otherwise if the method returns false the route is blocked.

The auth guard uses the authentication service to check if the user is logged in, if they are logged in it returns true from the canActivate() method, otherwise it returns false and redirects the user to the login page.

Angular route guards are attached to routes in the router config, this auth guard is used in app.routing.ts to protect the home page route.

import { Injectable } from '@angular/core';
import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';

import { AuthenticationService } from '@app/_services';

@Injectable({ providedIn: 'root' })
export class AuthGuard implements CanActivate {
        private router: Router,
        private authenticationService: AuthenticationService
    ) { }

    canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
        const currentUser = this.authenticationService.currentUserValue;
        if (currentUser) {
            // logged in so return true
            return true;

        // not logged in so redirect to login page with the return url
        this.router.navigate(['/login'], { queryParams: { returnUrl: state.url } });
        return false;

Http Error Interceptor

Path: /src/app/_helpers/error.interceptor.ts

The Error Interceptor intercepts http responses from the api to check if there were any errors. If there is a 401 Unauthorized response the user is automatically logged out of the application, all other errors are re-thrown up to the calling service so an alert with the error can be displayed on the screen.

It's implemented using the HttpInterceptor class included in the HttpClientModule, by extending the HttpInterceptor class you can create a custom interceptor to catch all error responses from the server in a single location.

Http interceptors are added to the request pipeline in the providers section of the app.module.ts file.

import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable, throwError } from 'rxjs';
import { catchError } from 'rxjs/operators';

import { AuthenticationService } from '@app/_services';

export class ErrorInterceptor implements HttpInterceptor {
    constructor(private authenticationService: AuthenticationService) { }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        return next.handle(request).pipe(catchError(err => {
            if (err.status === 401) {
                // auto logout if 401 response returned from api

            const error = err.error.message || err.statusText;
            return throwError(error);

Fake Backend Provider

Path: /src/app/_helpers/fake-backend.ts

In order to run and test the Angular application without a real backend API, the example uses a fake backend that intercepts the HTTP requests from the Angular app and send back "fake" responses. This is done by a class that implements the Angular HttpInterceptor interface, for more information on Angular HTTP Interceptors see or this article.

The fake backend contains a handleRoute function that checks if the request matches one of the faked routes in the switch statement, at the moment this includes POST requests to the /users/authenticate route for handling authentication, and GET requests to the /users route for getting all users.

Requests to the authenticate route are handled by the authenticate() function which checks the username and password against an array of hardcoded users. If the username and password are correct then an ok response is returned with the user details and a fake jwt token, otherwise an error response is returned.

Requests to the get users route are handled by the getUsers() function which checks if the user is logged in by calling the new isLoggedIn() helper function. If the user is logged in an ok() response with the whole users array is returned, otherwise a 401 Unauthorized response is returned by calling the new unauthorized() helper function.

If the request doesn't match any of the faked routes it is passed through as a real HTTP request to the backend API.

import { Injectable } from '@angular/core';
import { HttpRequest, HttpResponse, HttpHandler, HttpEvent, HttpInterceptor, HTTP_INTERCEPTORS } from '@angular/common/http';
import { Observable, of, throwError } from 'rxjs';
import { delay, mergeMap, materialize, dematerialize } from 'rxjs/operators';

import { User } from '@app/_models';

const users: User[] = [{ id: 1, username: 'test', password: 'test', firstName: 'Test', lastName: 'User' }];

export class FakeBackendInterceptor implements HttpInterceptor {
    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        const { url, method, headers, body } = request;

        // wrap in delayed observable to simulate server api call
        return of(null)
            .pipe(materialize()) // call materialize and dematerialize to ensure delay even if an error is thrown (

        function handleRoute() {
            switch (true) {
                case url.endsWith('/users/authenticate') && method === 'POST':
                    return authenticate();
                case url.endsWith('/users') && method === 'GET':
                    return getUsers();
                    // pass through any requests not handled above
                    return next.handle(request);

        // route functions

        function authenticate() {
            const { username, password } = body;
            const user = users.find(x => x.username === username && x.password === password);
            if (!user) return error('Username or password is incorrect');
            return ok({
                username: user.username,
                firstName: user.firstName,
                lastName: user.lastName,
                token: 'fake-jwt-token'

        function getUsers() {
            if (!isLoggedIn()) return unauthorized();
            return ok(users);

        // helper functions

        function ok(body?) {
            return of(new HttpResponse({ status: 200, body }))

        function error(message) {
            return throwError({ error: { message } });

        function unauthorized() {
            return throwError({ status: 401, error: { message: 'Unauthorised' } });

        function isLoggedIn() {
            return headers.get('Authorization') === 'Bearer fake-jwt-token';

export let fakeBackendProvider = {
    // use fake backend in place of Http service for backend-less development
    useClass: FakeBackendInterceptor,
    multi: true

JWT Interceptor

Path: /src/app/_helpers/jwt.interceptor.ts

The JWT Interceptor intercepts http requests from the application to add a JWT auth token to the Authorization header if the user is logged in.

It's implemented using the HttpInterceptor class included in the HttpClientModule, by extending the HttpInterceptor class you can create a custom interceptor to modify http requests before they get sent to the server.

Http interceptors are added to the request pipeline in the providers section of the app.module.ts file.

import { Injectable } from '@angular/core';
import { HttpRequest, HttpHandler, HttpEvent, HttpInterceptor } from '@angular/common/http';
import { Observable } from 'rxjs';

import { AuthenticationService } from '@app/_services';

export class JwtInterceptor implements HttpInterceptor {
    constructor(private authenticationService: AuthenticationService) { }

    intercept(request: HttpRequest<any>, next: HttpHandler): Observable<HttpEvent<any>> {
        // add authorization header with jwt token if available
        let currentUser = this.authenticationService.currentUserValue;
        if (currentUser && currentUser.token) {
            request = request.clone({
                setHeaders: {
                    Authorization: `Bearer ${currentUser.token}`

        return next.handle(request);

User Model

Path: /src/app/_models/user.ts

The user model is a small class that defines the properties of a user.

export class User {
    id: number;
    username: string;
    password: string;
    firstName: string;
    lastName: string;
    token?: string;

Authentication Service

Path: /src/app/_services/authentication.service.ts

The authentication service is used to login & logout of the Angular app, it notifies other components when the user logs in & out, and allows access the currently logged in user.

RxJS Subjects and Observables are used to store the current user object and notify other components when the user logs in and out of the app. Angular components can subscribe() to the public currentUser: Observable property to be notified of changes, and notifications are sent when the method is called in the login() and logout() methods, passing the argument to each subscriber. The RxJS BehaviorSubject is a special type of Subject that keeps hold of the current value and emits it to any new subscribers as soon as they subscribe, while regular Subjects don't store the current value and only emit values that are published after a subscription is created. For more info on communicating between components with RxJS Observables see this post.

The login() method sends the user credentials to the API via an HTTP POST request for authentication. If successful the user object including a JWT auth token are stored in localStorage to keep the user logged in between page refreshes. The user object is then published to all subscribers with the call to;.

The constructor() of the service initialises the currentUserSubject with the currentUser object from localStorage which enables the user to stay logged in between page refreshes or after the browser is closed. The public currentUser property is then set to this.currentUserSubject.asObservable(); which allows other components to subscribe to the currentUser Observable but doesn't allow them to publish to the currentUserSubject, this is so logging in and out of the app can only be done via the authentication service.

The currentUserValue getter allows other components an easy way to get the value of the currently logged in user without having to subscribe to the currentUser Observable.

The logout() method removes the current user object from local storage and publishes null to the currentUserSubject to notify all subscribers that the user has logged out.

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { BehaviorSubject, Observable } from 'rxjs';
import { map } from 'rxjs/operators';

import { environment } from '@environments/environment';
import { User } from '@app/_models';

@Injectable({ providedIn: 'root' })
export class AuthenticationService {
    private currentUserSubject: BehaviorSubject<User>;
    public currentUser: Observable<User>;

    constructor(private http: HttpClient) {
        this.currentUserSubject = new BehaviorSubject<User>(JSON.parse(localStorage.getItem('currentUser')));
        this.currentUser = this.currentUserSubject.asObservable();

    public get currentUserValue(): User {
        return this.currentUserSubject.value;

    login(username: string, password: string) {
        return<any>(`${environment.apiUrl}/users/authenticate`, { username, password })
            .pipe(map(user => {
                // store user details and jwt token in local storage to keep user logged in between page refreshes
                localStorage.setItem('currentUser', JSON.stringify(user));
                return user;

    logout() {
        // remove user from local storage to log user out

User Service

Path: /src/app/_services/user.service.ts

The user service contains a method for getting all users from the api, I included it to demonstrate accessing a secure api endpoint with the http authorization header set after logging in to the application, the auth header is set with a JWT token with the JWT Interceptor above. The secure endpoint in the example is a fake one implemented in the fake backend provider above.

import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

import { environment } from '@environments/environment';
import { User } from '@app/_models';

@Injectable({ providedIn: 'root' })
export class UserService {
    constructor(private http: HttpClient) { }

    getAll() {
        return this.http.get<User[]>(`${environment.apiUrl}/users`);

Home Component Template

Path: /src/app/home/home.component.html

The home component template contains html and angular 8 template syntax for displaying a simple welcome message and a list of users from a secure api endpoint.

<div class="card mt-4">
    <h4 class="card-header">You're logged in with Angular 8 & JWT!!</h4>
    <div class="card-body">
        <h6>Users from secure api end point</h6>
        <div *ngIf="loading" class="spinner-border spinner-border-sm"></div>
        <ul *ngIf="users">
            <li *ngFor="let user of users">{{user.firstName}} {{user.lastName}}</li>

Home Component

Path: /src/app/home/home.component.ts

The home component defines an angular 8 component that gets all users from the user service and makes them available to the template via a users array property.

import { Component } from '@angular/core';
import { first } from 'rxjs/operators';

import { User } from '@app/_models';
import { UserService, AuthenticationService } from '@app/_services';

@Component({ templateUrl: 'home.component.html' })
export class HomeComponent {
    loading = false;
    users: User[];

    constructor(private userService: UserService) { }

    ngOnInit() {
        this.loading = true;
        this.userService.getAll().pipe(first()).subscribe(users => {
            this.loading = false;
            this.users = users;

Login Component Template

Path: /src/app/login/login.component.html

The login component template contains a login form with username and password fields. It displays validation messages for invalid fields when the submit button is clicked. The form submit event is bound to the onSubmit() method of the login component.

The component uses reactive form validation to validate the input fields, for more information about angular reactive form validation see Angular 8 - Reactive Forms Validation Example.

<div class="col-md-6 offset-md-3 mt-5">
    <div class="alert alert-info">
        Username: test<br />
        Password: test
    <div class="card">
        <h4 class="card-header">Angular 8 JWT Login Example</h4>
        <div class="card-body">
            <form [formGroup]="loginForm" (ngSubmit)="onSubmit()">
                <div class="form-group">
                    <label for="username">Username</label>
                    <input type="text" formControlName="username" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.username.errors }" />
                    <div *ngIf="submitted && f.username.errors" class="invalid-feedback">
                        <div *ngIf="f.username.errors.required">Username is required</div>
                <div class="form-group">
                    <label for="password">Password</label>
                    <input type="password" formControlName="password" class="form-control" [ngClass]="{ 'is-invalid': submitted && f.password.errors }" />
                    <div *ngIf="submitted && f.password.errors" class="invalid-feedback">
                        <div *ngIf="f.password.errors.required">Password is required</div>
                <button [disabled]="loading" class="btn btn-primary">
                    <span *ngIf="loading" class="spinner-border spinner-border-sm mr-1"></span>
                <div *ngIf="error" class="alert alert-danger mt-3 mb-0">{{error}}</div>

Login Component

Path: /src/app/login/login.component.ts

The login component uses the authentication service to login to the application. If the user is already logged in they are automatically redirected to the home page.

The loginForm: FormGroup object defines the form controls and validators, and is used to access data entered into the form. The FormGroup is part of the Angular Reactive Forms module and is bound to the login template above with the [formGroup]="loginForm" directive.

import { Component, OnInit } from '@angular/core';
import { Router, ActivatedRoute } from '@angular/router';
import { FormBuilder, FormGroup, Validators } from '@angular/forms';
import { first } from 'rxjs/operators';

import { AuthenticationService } from '@app/_services';

@Component({ templateUrl: 'login.component.html' })
export class LoginComponent implements OnInit {
    loginForm: FormGroup;
    loading = false;
    submitted = false;
    returnUrl: string;
    error = '';

        private formBuilder: FormBuilder,
        private route: ActivatedRoute,
        private router: Router,
        private authenticationService: AuthenticationService
    ) { 
        // redirect to home if already logged in
        if (this.authenticationService.currentUserValue) { 

    ngOnInit() {
        this.loginForm ={
            username: ['', Validators.required],
            password: ['', Validators.required]

        // get return url from route parameters or default to '/'
        this.returnUrl = this.route.snapshot.queryParams['returnUrl'] || '/';

    // convenience getter for easy access to form fields
    get f() { return this.loginForm.controls; }

    onSubmit() {
        this.submitted = true;

        // stop here if form is invalid
        if (this.loginForm.invalid) {

        this.loading = true;
        this.authenticationService.login(this.f.username.value, this.f.password.value)
                data => {
                error => {
                    this.error = error;
                    this.loading = false;

App Component Template

Path: /src/app/app.component.html

The app component template is the root component template of the application, it contains the main nav bar which is only displayed for authenticated users, and a router-outlet directive for displaying the contents of each view based on the current route / path.

<!-- nav -->
<nav class="navbar navbar-expand navbar-dark bg-dark" *ngIf="currentUser">
    <div class="navbar-nav">
        <a class="nav-item nav-link" routerLink="/">Home</a>
        <a class="nav-item nav-link" (click)="logout()">Logout</a>

<!-- main app container -->
<div class="container">

App Component

Path: /src/app/app.component.ts

The app component is the root component of the application, it defines the root tag of the app as <app></app> with the selector property of the @Component() decorator.

It subscribes to the currentUser observable in the authentication service so it can reactively show/hide the main navigation bar when the user logs in/out of the application. I didn't worry about unsubscribing from the observable here because it's the root component of the application, the only time the component will be destroyed is when the application is closed which would destroy any subscriptions as well.

The app component contains a logout() method which is called from the logout link in the main nav bar above to log the user out and redirect them to the login page.

import { Component } from '@angular/core';
import { Router } from '@angular/router';

import { AuthenticationService } from './_services';
import { User } from './_models';

@Component({ selector: 'app', templateUrl: 'app.component.html' })
export class AppComponent {
    currentUser: User;

        private router: Router,
        private authenticationService: AuthenticationService
    ) {
        this.authenticationService.currentUser.subscribe(x => this.currentUser = x);

    logout() {

App Module

Path: /src/app/app.module.ts

The app module defines the root module of the application along with metadata about the module. For more info about angular 8 modules check out this page on the official docs site.

This is where the fake backend provider is added to the application, to switch to a real backend simply remove the providers located below the comment // provider used to create fake backend.

import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';
import { ReactiveFormsModule } from '@angular/forms';
import { HttpClientModule, HTTP_INTERCEPTORS } from '@angular/common/http';

// used to create fake backend
import { fakeBackendProvider } from './_helpers';

import { AppComponent } from './app.component';
import { appRoutingModule } from './app.routing';

import { JwtInterceptor, ErrorInterceptor } from './_helpers';
import { HomeComponent } from './home';
import { LoginComponent } from './login';

    imports: [
    declarations: [
    providers: [
        { provide: HTTP_INTERCEPTORS, useClass: JwtInterceptor, multi: true },
        { provide: HTTP_INTERCEPTORS, useClass: ErrorInterceptor, multi: true },

        // provider used to create fake backend
    bootstrap: [AppComponent]
export class AppModule { }

App Routing Module

Path: /src/app/app.routing.ts

Routing for the Angular app is configured as an array of Routes, each component is mapped to a path so the Angular Router knows which component to display based on the URL in the browser address bar. The home route is secured by passing the AuthGuard to the canActivate property of the route.

The Routes array is passed to the RouterModule.forRoot() method which creates a routing module with all of the app routes configured, and also includes all of the Angular Router providers and directives such as the <router-outlet></router-outlet> directive. For more information on Angular Routing and Navigation see

import { Routes, RouterModule } from '@angular/router';

import { HomeComponent } from './home';
import { LoginComponent } from './login';
import { AuthGuard } from './_helpers';

const routes: Routes = [
    { path: '', component: HomeComponent, canActivate: [AuthGuard] },
    { path: 'login', component: LoginComponent },

    // otherwise redirect to home
    { path: '**', redirectTo: '' }

export const appRoutingModule = RouterModule.forRoot(routes);

Production Environment Config

Path: /src/environments/

The production environment config contains variables required to run the application in production. This enables you to build the application with a different configuration for each different environment (e.g. production & development) without updating the app code.

When you build the application for production with the command ng build --prod, the output environment.ts is replaced with

export const environment = {
    production: true,
    apiUrl: 'http://localhost:4000'

Development Environment Config

Path: /src/environments/environment.ts

The development environment config contains variables required to run the application in development.

Environment config is accessed by importing the environment object into any Angular service of component with the line import { environment } from '@environments/environment' and accessing properties on the environment object, see the user service for an example.

export const environment = {
    production: false,
    apiUrl: 'http://localhost:4000'

Main Index Html File

Path: /src/index.html

The main index.html file is the initial page loaded by the browser that kicks everything off. The Angular CLI (with Webpack under the hood) bundles all of the compiled javascript files together and injects them into the body of the index.html page so the scripts can be loaded and executed by the browser.

<!DOCTYPE html>
    <base href="/" />
    <title>Angular 8 - JWT Authentication Tutorial & Example</title>
    <meta name="viewport" content="width=device-width, initial-scale=1">

    <!-- bootstrap css -->
    <link href="//" rel="stylesheet" />

Main (Bootstrap) File

Path: /src/main.ts

The main file is the entry point used by angular to launch and bootstrap the application.

import { enableProdMode } from '@angular/core';
import { platformBrowserDynamic } from '@angular/platform-browser-dynamic';

import { AppModule } from './app/app.module';
import { environment } from './environments/environment';

if (environment.production) {

    .catch(err => console.error(err));


Path: /src/polyfills.ts

Some features used by Angular 8 are not yet supported natively by all major browsers, polyfills are used to add support for features where necessary so your Angular 8 application works across all major browsers.

This file is generated by the Angular CLI when creating a new project with the ng new command, I've excluded the comments in the file for brevity.

import 'zone.js/dist/zone';

Global LESS/CSS Styles

Path: /src/styles.less

The global styles file contains LESS/CSS styles that are applied globally throughout the application.

/* You can add global styles to this file, and also import other style files */
a { cursor: pointer }

npm package.json

Path: /package.json

The package.json file contains project configuration information including package dependencies which get installed when you run npm install. Full documentation is available on the npm docs website.

    "name": "angular-8-jwt-authentication-example",
    "version": "1.0.0",
    "scripts": {
        "ng": "ng",
        "start": "ng serve --open",
        "build": "ng build",
        "test": "ng test",
        "lint": "ng lint",
        "e2e": "ng e2e"
    "private": true,
    "dependencies": {
        "@angular/animations": "~8.0.1",
        "@angular/common": "~8.0.1",
        "@angular/compiler": "~8.0.1",
        "@angular/core": "~8.0.1",
        "@angular/forms": "~8.0.1",
        "@angular/platform-browser": "~8.0.1",
        "@angular/platform-browser-dynamic": "~8.0.1",
        "@angular/router": "~8.0.1",
        "rxjs": "~6.4.0",
        "tslib": "^1.9.0",
        "zone.js": "~0.9.1"
    "devDependencies": {
        "@angular-devkit/build-angular": "~0.800.0",
        "@angular/cli": "~8.0.3",
        "@angular/compiler-cli": "~8.0.1",
        "@angular/language-service": "~8.0.1",
        "@types/node": "~8.9.4",
        "@types/jasmine": "~3.3.8",
        "@types/jasminewd2": "~2.0.3",
        "codelyzer": "^5.0.0",
        "jasmine-core": "~3.4.0",
        "jasmine-spec-reporter": "~4.2.1",
        "karma": "~4.1.0",
        "karma-chrome-launcher": "~2.2.0",
        "karma-coverage-istanbul-reporter": "~2.0.1",
        "karma-jasmine": "~2.0.1",
        "karma-jasmine-html-reporter": "^1.4.0",
        "protractor": "~5.4.0",
        "ts-node": "~7.0.0",
        "tslint": "~5.15.0",
        "typescript": "~3.4.3"

TypeScript tsconfig.json

Path: /tsconfig.json

The tsconfig.json file configures how the TypeScript compiler will convert TypeScript into JavaScript that is understood by the browser. More information is available on the TypeScript docs.

Most of the file is unchanged from when it was generated by the Angular CLI, only the paths property has been added to map @app and @environments to the /src/app and /src/environments directories. This allows imports to be relative to the app and environments folders by prefixing import paths with aliases instead of having to use long relative paths (e.g. import MyComponent from '../../../MyComponent').

    "compileOnSave": false,
    "compilerOptions": {
        "baseUrl": "./",
        "outDir": "./dist/out-tsc",
        "sourceMap": true,
        "declaration": false,
        "downlevelIteration": true,
        "emitDecoratorMetadata": true,
        "experimentalDecorators": true,
        "module": "esnext",
        "moduleResolution": "node",
        "importHelpers": true,
        "target": "es2015",
        "typeRoots": [
        "lib": [
        "paths": {
            "@app/*": ["src/app/*"],
            "@environments/*": ["src/environments/*"]


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