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angular material - How to use buffer Progress bar

app.component.ts 

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

@Component({
  selector: 'app-root',
  templateUrl: './app.component.html',
  styleUrls: ['./app.component.css']
})


export class AppComponent {
  isDisabled:boolean = false;
  progress:number = 0;
  timer:any;
  maxValue:number = 25;
  percentage:number = 0;
  bufferProgress:number = 0;

  onClick(){
    this.progress = 0;
    this.isDisabled = true;
    this.timer = setInterval(() => this.updateProgress(), 1000)
  }

  updateProgress(){
    this.progress++
    if(this.progress>=this.maxValue){
      clearInterval(this.timer);
      this.isDisabled = false;
    }
    this.calculatePercentage()
  }

  calculatePercentage(){
    //this.percentage = Math.round((this.progress / this.maxValue) * 100);
    //this.percentage = Math.ceil((this.progress / this.maxValue) * 100);
    this.percentage = Math.floor((this.progress / this.maxValue) * 100);
    this.updateBuffer();
  }

  updateBuffer(){
    if(this.bufferProgress<=100){
      this.bufferProgress = this.percentage + 10;
      if(this.bufferProgress>100){
        this.bufferProgress = 100;
      }
    }
  }
}
app.component.html 

<h2 style="padding-top:25px; padding-bottom:25px;">
    Angular Material - How to use buffer Progress bar
</h2>


<button 
    mat-raised-button
    color="primary"
    (click)="onClick()" 
    [disabled]="isDisabled" 
    style="margin-bottom:25px;">
        Run {{maxValue}} Tasks
</button>


<h3>
    {{
        'Task ' + progress + ' of ' + maxValue + ' done.'
        + ' ( '+ percentage + '% done. )'
    }}
</h3>

<h3>{{'Buffered : ' + bufferProgress + '%'}}</h3>


<mat-progress-bar 
    mode="buffer" 
    [bufferValue]="bufferProgress"
    [value]="percentage">
</mat-progress-bar>
app.module.ts [import] 

import {MatProgressBarModule} from '@angular/material/progress-bar';
import {MatButtonModule} from '@angular/material/button'
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