overleaf/services/web/frontend/js/features/pdf-preview/util/pdf-js-versions.js

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// To add a new version, copy and adjust one of the `importPDFJS*` functions below,
// add the variant to the "switch" statement, and add to `pdfjsVersions` in webpack.config.js
import 'core-js/stable/global-this' // polyfill for globalThis (used by pdf.js)
import 'core-js/stable/promise/all-settled' // polyfill for Promise.allSettled (used by pdf.js)
import 'core-js/stable/structured-clone' // polyfill for global.StructuredClone (used by pdf.js)
import 'core-js/stable/array/at' // polyfill for Array.prototype.at (used by pdf.js)
import getMeta from '@/utils/meta'
import { createWorker } from '@/utils/worker'
async function importPDFJS401() {
const cMapUrl = '/js/pdfjs-dist401/cmaps/'
const standardFontDataUrl = '/fonts/pdfjs-dist401/'
const imageResourcesPath = '/images/pdfjs-dist401/'
// ensure that PDF.js is loaded before importing the viewer
const PDFJS = await import('pdfjs-dist401/legacy/build/pdf')
const [PDFJSViewer] = await Promise.all([
import('pdfjs-dist401/legacy/web/pdf_viewer'),
import('pdfjs-dist401/legacy/web/pdf_viewer.css'),
])
createWorker(() => {
PDFJS.GlobalWorkerOptions.workerPort = new Worker(
new URL('pdfjs-dist401/legacy/build/pdf.worker.mjs', import.meta.url) // NOTE: .mjs extension
)
})
return {
PDFJS,
PDFJSViewer,
cMapUrl,
imageResourcesPath,
standardFontDataUrl,
}
}
async function importPDFJS213() {
const cMapUrl = '/js/pdfjs-dist213/cmaps/'
const standardFontDataUrl = '/fonts/pdfjs-dist213/'
const imageResourcesPath = '/images/pdfjs-dist213/'
// ensure that PDF.js is loaded before importing the viewer
const PDFJS = await import('pdfjs-dist213/legacy/build/pdf')
const [PDFJSViewer] = await Promise.all([
import('pdfjs-dist213/legacy/web/pdf_viewer'),
import('pdfjs-dist213/legacy/web/pdf_viewer.css'),
])
createWorker(() => {
PDFJS.GlobalWorkerOptions.workerPort = new Worker(
new URL('pdfjs-dist213/legacy/build/pdf.worker.js', import.meta.url)
)
})
return {
PDFJS,
PDFJSViewer,
cMapUrl,
imageResourcesPath,
standardFontDataUrl,
}
}
async function importPDFJS() {
const variant = getMeta('ol-pdfjsVariant') || 'default'
// NOTE: split test variants must have at least 3 characters
switch (variant) {
case '213':
case 'default':
return importPDFJS213()
case '401':
return importPDFJS401()
}
}
export default importPDFJS()