Through a Forecast in Angular

import { Component, AfterViewInit, OnDestroy, ViewChild } from '@angular/core';
import {
  ChartComponent,
  ApexAxisChartSeries,
  ApexNonAxisChartSeries,
  ApexChart,
  ApexXAxis,
  ApexYAxis,
  ApexTitleSubtitle,
  ApexDataLabels,
  ApexStroke,
  ApexFill,
  ApexLegend,
  ApexTooltip,
  ApexMarkers,
  ApexPlotOptions,
  ApexResponsive,
  ApexGrid,
  ApexAnnotations,
  ApexStates,
  ApexTheme,
  NgApexchartsModule,
} from 'ng-apexcharts';

export type ChartOptions = {
  series?: ApexAxisChartSeries | ApexNonAxisChartSeries;
  chart?: ApexChart;
  xaxis?: ApexXAxis;
  yaxis?: ApexYAxis | ApexYAxis[];
  title?: ApexTitleSubtitle;
  subtitle?: ApexTitleSubtitle;
  dataLabels?: ApexDataLabels;
  stroke?: ApexStroke;
  fill?: ApexFill;
  legend?: ApexLegend;
  tooltip?: ApexTooltip;
  markers?: ApexMarkers;
  plotOptions?: ApexPlotOptions;
  responsive?: ApexResponsive[];
  grid?: ApexGrid;
  annotations?: ApexAnnotations;
  states?: ApexStates;
  theme?: ApexTheme;
  colors?: string[];
  labels?: any;
};

@Component({
  selector: 'app-chart',
  standalone: true,
  imports: [NgApexchartsModule],
  templateUrl: './chart.component.html',
})
export class AppChart implements AfterViewInit, OnDestroy {
  @ViewChild('chart') chart!: ChartComponent;
  private MONTHS: any = ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep'];

  private PLANS: any = ['Team', 'Personal'];

  private SUBSCRIPTIONS: any = [
        [120, 132, 128, 145, 150, 162, 170, 178, 186],
        [80, 84, 90, 88, 96, 101, 104, 110, 114],
      ];

  private REGIONS: any = {
        europe: [
          [52, 58, 55, 63, 66, 71, 74, 78, 81],
          [30, 33, 35, 34, 38, 40, 41, 43, 45],
        ],
        americas: [
          [48, 51, 50, 57, 58, 63, 66, 69, 72],
          [36, 37, 40, 39, 42, 44, 46, 49, 50],
        ],
      };

  private seriesFor = (region: any): any => {
        return this.PLANS.map(function (name, i) {
          var s = { name: name, data: this.SUBSCRIPTIONS[i] }
          if (region) s.highlightData = this.REGIONS[region][i]
          return s
        })
      };

  private pickRegion = (region: any): any => {
        document.querySelectorAll('[data-region]').forEach(function (b) {
          b.classList.toggle('active', b.getAttribute('data-region') === region)
        })
        return Promise.all(
          ['plans-stacked', 'plans-line'].map(function (id) {
            return ApexCharts.getChartByID(id).updateSeries(this.seriesFor(region))
          }),
        )
      };

  private wireRegions = (): any => {
        document.querySelectorAll('[data-region]').forEach(function (b) {
          b.addEventListener('click', function () {
            this.pickRegion(b.getAttribute('data-region'))
          })
        })
      };

  public chartOptions: Partial<ChartOptions> = {
          series: this.seriesFor('europe'),
          chart: {
            id: 'plans-stacked',
            type: 'bar',
            height: 320,
            stacked: true,
            toolbar: { show: false },
          },
          colors: ['#0f766e', '#d97706'],
          plotOptions: {
            bar: {
              columnWidth: '55%',
              borderRadius: 4,
              borderRadiusApplication: 'end',
            },
          },
          forecastDataPoints: {
            count: 3,
            fillOpacity: 0.5,
            dashArray: 4,
            strokeWidth: 1,
          },
          dataLabels: { enabled: false },
          xaxis: { categories: this.MONTHS },
          yaxis: { title: { text: 'New subscriptions' } },
          legend: { position: 'bottom' },
          tooltip: { shared: true, intersect: false },
        };

  public chartOptions2: Partial<ChartOptions> = {
          series: this.seriesFor('europe'),
          chart: {
            id: 'plans-line',
            type: 'line',
            height: 320,
            toolbar: { show: false },
          },
          colors: ['#0f766e', '#d97706'],
          stroke: { curve: 'stepline', width: 3 },
          forecastDataPoints: { count: 3, dashArray: 6 },
          dataLabels: { enabled: false },
          xaxis: { categories: this.MONTHS },
          yaxis: { min: 0, title: { text: 'New subscriptions' } },
          legend: { position: 'bottom' },
          tooltip: { shared: true, intersect: false },
        };
  ngAfterViewInit() {
    (window as any).ApexCharts.setLicense('APEX-eyJleHBpcnlEYXRlIjoiMjEyNi0wNy0wNCIsImlzc3VlRGF0ZSI6IjIwMjYtMDctMjgiLCJwbGFuIjoicHJlbWl1bSIsImRvbWFpbnMiOlsiYXBleGNoYXJ0cy5jb20iLCIxMjcuMC4wLjEiLCJsb2NhbGhvc3QiXSwic2lnIjoieVBmb1VCc0Z3TU9ZdUEyaEZkR0I2Y1FtZ0JITUtXcVdJSjB2NVRESXRZbFR3eDJMUmh6R2x0RUc3VXJ4X0s3b25ZMWRZb2Z2VGItN01ydFYyNDVyOWcifQ==');
    this.wireRegions()

    function pickRegion(region) {
          document.querySelectorAll('[data-region]').forEach(function (b) {
            b.classList.toggle('active', b.getAttribute('data-region') === region)
          })
          return Promise.all(
            ['plans-stacked', 'plans-line'].map(function (id) {
              return ApexCharts.getChartByID(id).updateSeries(this.seriesFor(region))
            }),
          )
        }
    function wireRegions() {
          document.querySelectorAll('[data-region]').forEach(function (b) {
            b.addEventListener('click', () => {
              this.pickRegion(b.getAttribute('data-region'))
            })
          })
        }
  }

  ngOnDestroy() {
    // no cleanup needed
  }
}