Initial Vite migration setup

vite.package.config.ts

@@ -0,0 +1,42 @@
+import { defineConfig } from 'vite';
+import react from '@vitejs/plugin-react';
+import { fileURLToPath } from 'node:url';
+import { execSync } from 'node:child_process';
+
+export default defineConfig({
+  plugins: [
+    {
+      name: 'build-packages-first',
+      async config() {
+        // First build all packages
+        await Promise.all([
+          execSync('cd packages/common && yarn build', { stdio: 'inherit' }),
+          execSync('cd packages/math && yarn build', { stdio: 'inherit' }),
+          execSync('cd packages/excalidraw && yarn build', { stdio: 'inherit' })
+        ]);
+      }
+    },
+    react()
+  ],
+  build: {
+    lib: {
+      entry: fileURLToPath(new URL('./packages/excalidraw/src/index.tsx', import.meta.url)),
+      name: 'Excalidraw',
+      fileName: (format) => `excalidraw.${format}.js`
+    },
+    rollupOptions: {
+      external: ['react', 'react-dom'],
+      output: {
+        globals: {
+          react: 'React',
+          'react-dom': 'ReactDOM'
+        },
+        format: 'es'
+      },
+      onwarn: (warning, warn) => {
+        if (warning.code === 'CIRCULAR_DEPENDENCY') return;
+        warn(warning);
+      }
+    }
+  }
+});