The Web Bluetooth module for Angular: https://medium.com/@wassimchegham/the-web-bluetooth-module-for-angular-9336c9535d04

medium-9336c9535d04-app.component.ts

import { Component, OnInit, NgZone } from '@angular/core';
import { BatteryLevelService } from '../battery-level.service';
import { BluetoothCore } from '@manekinekko/angular-web-bluetooth';
@Component({
  selector: 'ble-battery-level',
  //...
  providers: [ BatteryLevelService, BluetoothCore ]
})
export class BatteryLevelComponent implements OnInit { //...