Initial Vite migration setup

packages/excalidraw/vite.config.ts

@@ -0,0 +1,22 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import { fileURLToPath } from 'node:url';
+
+export default defineConfig({
+  build: {
+    lib: {
+      entry: fileURLToPath(new URL('./index.tsx', import.meta.url)),
+      name: 'Excalidraw',
+      fileName: (format) => `excalidraw.${format}.js`
+    },
+    rollupOptions: {
+      external: ['react', 'react-dom'],
+      output: {
+        globals: {
+          react: 'React',
+          'react-dom': 'ReactDOM'
+        }
+      }
+    }
+  }
+});