import { NgModule } from '@angular/core';
import { BrowserModule } from '@angular/platform-browser';

// for HttpClient import:
import { LoadingBarHttpClientModule } from '@ngx-loading-bar/http-client';

// for Router import:
import { LoadingBarRouterModule } from '@ngx-loading-bar/router';

// for Core import:
import { LoadingBarModule } from '@ngx-loading-bar/core';

import { AppComponent } from './app';

@NgModule({
  ...
  imports: [
    ...

    // for HttpClient use:
    LoadingBarHttpClientModule,

    // for Router use:
    LoadingBarRouterModule,

    // for Core use:
    LoadingBarModule
  ],
})
export class AppModule {}

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

@Component({
  selector: 'app',
  template: `
    ...
    <ngx-loading-bar></ngx-loading-bar>
  `,
})
export class AppComponent {}

import { LOADING_BAR_CONFIG } from '@ngx-loading-bar/core';

@NgModule({
  providers: [
    providers: [{ provide: LOADING_BAR_CONFIG, useValue: { latencyThreshold: 100 } }],
  ]
})

// ignore a particular $http GET:
httpClient.get('/status', {
  headers: { ignoreLoadingBar: '' },
});

this.router.navigateByUrl('/custom-path', {
  state: { ignoreLoadingBar: true },
});

// select the router loader instance
const state = this.loader.useRef('router');

// control state
state.start();
state.complete();

// get the progress value
const value$ = state.value$;

import { NgModule } from '@angular/core';

import { LoadingBarModule } from '@ngx-loading-bar/core';

@NgModule({
  ...
  imports: [
    ...

    LoadingBarModule,
  ],
})
export class AppModule {}

import { Component } from '@angular/core';
import { LoadingBarService } from '@ngx-loading-bar/core';

@Component({
  selector: 'app',
  template: `
    ...
    <ngx-loading-bar></ngx-loading-bar>
    <button (click)="loader.start()">start</button>
    <button (click)="loader.complete()">Complete</button>
  `,
})
export class App {
  loader = this.loadingBar.useRef();
  constructor(private loadingBar: LoadingBarService) {}
}

import { Component } from '@angular/core';
import { LoadingBarService } from '@ngx-loading-bar/core';

@Component({
  selector: 'app',
  template: `
    ...
    <mat-progress-bar mode="determinate" [value]="loader.value$ | async"></mat-progress-bar>
  `,
})
export class App {
  constructor(public loader: LoadingBarService) {}
}