Method to get destination from outline about react-pdf HOT 2 OPEN

import type { RefProxy } from 'pdfjs-dist/types/src/display/api.js';

class Ref {
  num: number;
  gen: number;

  constructor({ num, gen }: { num: number; gen: number }) {
    this.num = num;
    this.gen = gen;
  }

  toString() {
    let str = `${this.num}R`;
    if (this.gen !== 0) {
      str += this.gen;
    }
    return str;
  }
}

const getDestination = (pdf: any, item: any) => {
  if (typeof item.dest === 'string') {
    return pdf.getDestination(item.dest);
  }

  return item.dest;
};

const getPageIndex = async (pdf: any, item: any) => {
  const destination = await getDestination(pdf, item);

  if (!destination) {
    throw new Error('Destination not found.');
  }

  const [ref] = destination as [RefProxy];

  return pdf.getPageIndex(new Ref(ref));
};
 
// Callback
       <ListItemButton key={`${index}`} onClick={(_event) => {
        getPageIndex(pdf, data).then((pageIndex) => {
          virtuosoRef.current.scrollToIndex(pageIndex);