src/components/DrawPDFFields/index.tsx

@@ -36,8 +36,10 @@ import {
 import { truncate } from 'lodash'
 import { hexToNpub } from '../../utils'
 import { toPdfFiles } from '../../utils/pdf.ts'
-PDFJS.GlobalWorkerOptions.workerSrc =
-  'node_modules/pdfjs-dist/build/pdf.worker.mjs'
+PDFJS.GlobalWorkerOptions.workerSrc = new URL(
+  'pdfjs-dist/build/pdf.worker.mjs',
+  import.meta.url
+).toString()
 
 interface Props {
   selectedFiles: File[]

src/utils/pdf.ts

@@ -3,8 +3,10 @@ import * as PDFJS from 'pdfjs-dist'
 import { PDFDocument } from 'pdf-lib'
 import { Mark } from '../types/mark.ts'
 
-PDFJS.GlobalWorkerOptions.workerSrc =
-  'node_modules/pdfjs-dist/build/pdf.worker.mjs'
+PDFJS.GlobalWorkerOptions.workerSrc = new URL(
+  'pdfjs-dist/build/pdf.worker.mjs',
+  import.meta.url
+).toString()
 
 /**
  * Scale between the PDF page's natural size and rendered size

vite.config.ts

@@ -5,6 +5,15 @@ import tsconfigPaths from 'vite-tsconfig-paths'
 export default defineConfig({
   plugins: [react(), tsconfigPaths()],
   build: {
-    target: 'ES2022'
+    target: 'ES2022',
+    rollupOptions: {
+      output: {
+        manualChunks(id) {
+          if (id.includes('pdfjs-dist/build/pdf.worker.mjs')) {
+            return 'pdf.worker'
+          }
+        }
+      }
+    }
   }
 })