index.ts

import PDFDocument from 'pdfkit'

const imageToPDF = (pages: (string | Buffer)[], size: PDFKit.PDFDocumentOptions['size']): PDFKit.PDFDocument => {
  const doc: PDFKit.PDFDocument = new PDFDocument({ margin: 0, size })

  for (let index: number = 0; index < pages.length; index++) {
    if (index != 0) doc.addPage()

    doc.image(pages[index], 0, 0, { 
	    fit: [doc.page.width - doc.page.margins.left - doc.page.margins.right, doc.page.height - doc.page.margins.top - doc.page.margins.bottom],
      align: 'center', valign: 'center' 
    })
  }

  doc.end()

  return doc
};

// Importing from a file was always causing issues with either CJS or ESM and I felt bundling was an overkill
const sizes = {
  "4A0": [4767.87, 6740.79],
  "2A0": [3370.39, 4767.87],
  "A0": [2383.94, 3370.39],
  "A1": [1683.78, 2383.94],
  "A2": [1190.55, 1683.78],
  "A3": [841.89, 1190.55],
  "A4": [595.28, 841.89],
  "A5": [419.53, 595.28],
  "A6": [297.64, 419.53],
  "A7": [209.76, 297.64],
  "A8": [147.40, 209.76],
  "A9": [104.88, 147.40],
  "A10": [73.70, 104.88],
  "B0": [2834.65, 4008.19],
  "B1": [2004.09, 2834.65],
  "B2": [1417.32, 2004.09],
  "B3": [1000.63, 1417.32],
  "B4": [708.66, 1000.63],
  "B5": [498.90, 708.66],
  "B6": [354.33, 498.90],
  "B7": [249.45, 354.33],
  "B8": [175.75, 249.45],
  "B9": [124.72, 175.75],
  "B10": [87.87, 124.72],
  "C0": [2599.37, 3676.54],
  "C1": [1836.85, 2599.37],
  "C2": [1298.27, 1836.85],
  "C3": [918.43, 1298.27],
  "C4": [649.13, 918.43],
  "C5": [459.21, 649.13],
  "C6": [323.15, 459.21],
  "C7": [229.61, 323.15],
  "C8": [161.57, 229.61],
  "C9": [113.39, 161.57],
  "C10": [79.37, 113.39],
  "RA0": [2437.80, 3458.27],
  "RA1": [1729.13, 2437.80],
  "RA2": [1218.90, 1729.13],
  "RA3": [864.57, 1218.90],
  "RA4": [609.45, 864.57],
  "SRA0": [2551.18, 3628.35],
  "SRA1": [1814.17, 2551.18],
  "SRA2": [1275.59, 1814.17],
  "SRA3": [907.09, 1275.59],
  "SRA4": [637.80, 907.09],
  "EXECUTIVE": [521.86, 756.00],
  "FOLIO": [612.00, 936.00],
  "LEGAL": [612.00, 1008.00],
  "LETTER": [612.00, 792.00],
  "TABLOID": [792.00, 1224.00]
}

export default imageToPDF
export { imageToPDF as convert, sizes }