extract images from pdf with pdf-lib, Jimp and file-type

extract-images-from-pdf.ts

import { PDFDocument, PDFRawStream } from 'pdf-lib';
import * as FileType from 'file-type';
import Jimp from 'jimp';

const extractImageFromPDF = async (file: Buffer) => {
  const pdfDoc = await PDFDocument.load(file, { ignoreEncryption: true });
  const indirects = pdfDoc.context.enumerateIndirectObjects();
  const images = [];
  for (let i = 0; i < indirects.length; i += 1) {
    const [, pdfObject] = indirects[i];
    if (pdfObject instanceof PDFRawStream) {
      const buffer = Buffer.from(pdfObject.contents);
      const { mime } = await FileType.fromBuffer(buffer);
      const image = await Jimp.read(buffer);
      images.push(await image.getBufferAsync(mime));
    }
  }
  return images;
};

export {
  extractImageFromPDF,
};