Initial Vite migration setup

packages/math/vite.config.ts

@@ -0,0 +1,27 @@
+import { defineConfig } from 'vite';
+import { fileURLToPath } from 'node:url';
+
+export default defineConfig({
+  build: {
+    lib: {
+      entry: fileURLToPath(new URL('./src/index.ts', import.meta.url)),
+      name: 'ExcalidrawMath',
+      fileName: () => 'index.js', // Changed to match package.json
+    },
+    outDir: 'dist/prod', // Added to match package.json
+    rollupOptions: {
+      external: ['react', 'react-dom'],
+      output: {
+        globals: {
+          react: 'React',
+          'react-dom': 'ReactDOM'
+        },
+        format: 'es' // Still produces ESM; UMD needs separate config if required
+      },
+      onwarn: (warning, warn) => {
+        if (warning.code === 'CIRCULAR_DEPENDENCY') return;
+        warn(warning);
+      }
+    }
+  }
+});