maybe relative?

index.html

@@ -49,7 +49,7 @@ <h1>Display a Supernote File</h1>
   class SupernoteWorker {
     constructor () {
       this.worker = new Worker(
-        new URL('src/worker.js?v=' + Date.now(), import.meta.url),
+        new URL('./src/worker.js?v=' + Date.now(), import.meta.url),
         { type: 'module' },
       )
     }

vite.config.js

@@ -1,25 +1,9 @@
-import { defineConfig } from 'vite'
-import { nodePolyfills } from 'vite-plugin-node-polyfills'
-
-export default defineConfig({
-  base: './', // Ensure assets use relative paths
-  // server: {
-  //   proxy: {
-  //     '/sparql': {
-  //       target: 'https://endpoint-with-cors/sparql',
-  //       changeOrigin: true,
-  //       secure: false,
-  //       rewrite: (path) => path.replace(/^\/sparql/, '')
-  //     },
-  //   },
-  // },
-  plugins: [
-    nodePolyfills({
-      include: ['path', 'stream', 'util'], exclude: ['http'], globals: {
-        Buffer: true, global: true, process: true,
-      }, overrides: {
-        fs: 'memfs',
-      }, protocolImports: true,
-    })],
-})
-
+export default {
+  base: './',
+  worker: {
+    format: 'es',
+  },
+  define: {
+    'global': {},
+  },
+}