How to use the pdfjs-dist.version function in pdfjs-dist

options = DEFAULT_OPTIONS;
    }
    if (typeof options.pagerender !== 'function') {
        options.pagerender = DEFAULT_OPTIONS.pagerender;
    }
    if (typeof options.max !== 'number') {
        options.max = DEFAULT_OPTIONS.max;
    }
    if (typeof options.version !== 'string') {
        options.version = DEFAULT_OPTIONS.version;
    }
    if (options.version === 'default') {
        options.version = DEFAULT_OPTIONS.version;
    }

    ret.version = PDFJS.version;

    // Disable workers to avoid yet another cross-origin issue (workers need
    // the URL of the script to be loaded, and dynamically loading a cross-origin
    // script does not work).
    PDFJS.disableWorker = true;
    let doc;

    return new Promise((resolve, reject) => {
        PDFJS.getDocument(dataBuffer)
            .promise.then(document => {
                doc = document;
                ret.numpages = doc.numPages;

                let metaData;

                doc.getMetadata()

return pdfDocument.getMetadata().then(function (data) {
      let info = data.info; let metadata = data.metadata;
      self.documentInfo = info ;
      self.metadata = metadata;

      // Provides some basic debug information
      console.log("PDF " + pdfDocument.fingerprint + " [" +
                  info.PDFFormatVersion + " " + (info.Producer || "-").trim() +
                  " / " + (info.Creator || "-").trim() + "]" +
                  " (PDF.js: " + (pdfjsLib.version || "-") + ")");

      let pdfTitle;
      if (metadata && metadata.has("dc:title")) {
        let title = metadata.get("dc:title");
        // Ghostscript sometimes returns 'Untitled', so prevent setting the
        // title to 'Untitled.
        if (title !== "Untitled") {
          pdfTitle = title;
        }
      }

      if (!pdfTitle && info && info["Title"]) {
        pdfTitle = info["Title"];
      }

      if (pdfTitle) {

import * as React from 'react';
import {Logger} from 'polar-shared/src/logger/Logger';
import {URLStr} from "polar-shared/src/util/Strings";
import PDFJS from 'pdfjs-dist';
import {Numbers} from "polar-shared/src/util/Numbers";

console.log("Running with pdf.js version: " + PDFJS.version);

// TODO: I'm not sure this is the safest way to find the worker path.
PDFJS.GlobalWorkerOptions.workerSrc = '../../../node_modules/pdfjs-dist/build/pdf.worker.js';

const log = Logger.create();

console.log("FIXME: ", (PDFJS as any).renderTextLayer);

export class PDFViewer extends React.Component {

    // https://mozilla.github.io/pdf.js/examples/
    constructor(props: IProps, context: any) {
        super(props, context);

        this.doRender = this.doRender.bind(this);

export const usePdf = ({
  canvasEl,
  file,
  onPageLoaded = undefined,
  scale = 1,
  rotate = 0,
  page = 1,
  cMapUrl,
  cMapPacked,
  workerSrc = `//cdnjs.cloudflare.com/ajax/libs/pdf.js/${pdfjs.version}/pdf.worker.js`,
  withCredentials = false,
}: HookProps) => {
  const [pdf, setPdf] = useState();
  const renderTask = useRef(null);

  useEffect(() => {
    pdfjs.GlobalWorkerOptions.workerSrc = workerSrc;
  }, [workerSrc]);

  useEffect(() => {
    const config: pdfjs.PDFSource = { url: file, withCredentials };
    if (cMapUrl) {
      config.cMapUrl = cMapUrl;
      config.cMapPacked = cMapPacked;
    }
    pdfjs.getDocument(config).promise.then(setPdf);