CODE EXAMPLE FOR TYPESCRIPT

function call in Angular using typescript creates infinite loop

import { Pipe, PipeTransform } from '@angular/core';

@Pipe({
  name: 'filterCis'
})
export class FilterCisPipe implements PipeTransform {

  public transform(cis: Structure[], baseline: Baseline): Structure[] {
    if(baseline.isHideElementsActivated){
      let newArray = [...cis]
      let result =  newArray.filter(ci => ci.checked === true).map((item,index) => {
        return {
          ...item,
          children : retreiveChildren(item.children)
        }
      })
      console.log("Result array...." , result)
      return result;
    }else{
      return cis;
    }
  }

  private retreiveChildren(children: Structure[]) : Structure[] {
    let filteredCis =  children && children.filter((ci) =>{
        if(ci.children && ci.children.length > 0){
           retreiveChildren(ci.children);
        }
        return ci.checked === true;
      }) ;
    return filteredCis;
  }

}