error TS2345: Argument of type '(child: { tagName: string; }) => boolean' is not assignable to parameter of type '(value: {}, index: number, obj: {}[]) => boolean'.
  Types of parameters 'child' and 'value' are incompatible.
    Property 'tagName' is missing in type '{}' but required in type '{ tagName: string; }'.

17       (child: { tagName: string }): boolean => child.tagName === 'AUDIO',
         ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

  src/components/Subscriber/Subscriber.tsx:17:17
    17       (child: { tagName: string }): boolean => child.tagName === 'AUDIO',
                       ~~~~~~~
    'tagName' is declared here.