Skip to content

fix(pdf): self-host worker as .js (prod .mjs MIME breaks module import) #101

New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Merged
lyfuci merged 1 commit into from
Jul 9, 2026
Merged

fix(pdf): self-host worker as .js (prod .mjs MIME breaks module import) #101

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
29 changes: 29 additions & 0 deletions public/pdfjs/pdf.worker.min.js
View file
Open in desktop

Large diffs are not rendered by default.

20 changes: 12 additions & 8 deletions src/lib/pdf.ts
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -1,21 +1,25 @@
// PDF rendering helpers built on pdf.js (pdfjs-dist), fully client-side.
//
// Runtime assets (cmaps / standard fonts / wasm) are served from `public/pdfjs/`
// rather than a CDN — the site is COOP/COEP cross-origin-isolated and makes no
// external calls, so both constraints forbid the pdf.js default CDN URLs. When
// bumping pdfjs-dist, re-copy those three dirs:
// Runtime assets (worker + cmaps / standard fonts / wasm) are served from
// `public/pdfjs/` rather than a CDN — the site is COOP/COEP cross-origin-
// isolated and makes no external calls, so both constraints forbid the pdf.js
// default CDN URLs. When bumping pdfjs-dist, re-copy them:
// cp -r node_modules/pdfjs-dist/{cmaps,standard_fonts,wasm} public/pdfjs/
// cp node_modules/pdfjs-dist/build/pdf.worker.min.mjs public/pdfjs/pdf.worker.min.js
//
// The worker is deliberately copied to a `.js` extension (not the source
// `.mjs`): pdf.js loads it as a module worker regardless of extension, and our
// nginx serves `.js` as `application/javascript` while `.mjs` falls through to
// `application/octet-stream`, which browsers refuse to import as a module.
import * as pdfjsLib from 'pdfjs-dist'
// Version-matched worker, bundled same-origin (?url gives a hashed asset URL).
import workerUrl from 'pdfjs-dist/build/pdf.worker.min.mjs?url'
import type { PDFDocumentProxy } from 'pdfjs-dist'

export { parsePageRange } from './pdf-range'

pdfjsLib.GlobalWorkerOptions.workerSrc = workerUrl

// Local, self-contained asset roots (trailing slash required by pdf.js).
const ASSET_BASE = `${import.meta.env.BASE_URL}pdfjs/`

pdfjsLib.GlobalWorkerOptions.workerSrc = `${ASSET_BASE}pdf.worker.min.js`
const DOC_ASSETS = {
cMapUrl: `${ASSET_BASE}cmaps/`,
cMapPacked: true,
Expand Down
Loading