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

@Pipe({
  name : 'treeSearch',
})

export class TreeSearchPipe implements PipeTransform {
  public transform(array: any[]|null, filterFn: (item: any) => boolean, getChildren: (item: any) => any[]): any[] {
    const transformSingle = (item: any): boolean =>
      filterFn(item) ||
      (getChildren(item)
        ? getChildren(item).some(transformSingle)
        : false)
    return array
      ? array.filter(transformSingle)
      : []
  }
}