sdk from back and first configuration for firebase

frontend-web/src/lib/firebaseConfig.js

@@ -0,0 +1,22 @@
+import { getApps, initializeApp, getApp } from 'firebase/app';
+import { getDataConnect } from 'firebase/data-connect';
+import { getAuth } from 'firebase/auth';
+import { connectorConfig } from '@dataconnect/generated';
+
+const firebaseConfig = {
+  apiKey: import.meta.env.VITE_FIREBASE_API_KEY,
+  authDomain: import.meta.env.VITE_FIREBASE_AUTH_DOMAIN,
+  projectId: import.meta.env.VITE_FIREBASE_PROJECT_ID,
+  appId: import.meta.env.VITE_FIREBASE_APP_ID,
+};
+
+export function getFirebaseApp() {
+  if (getApps().length === 0) {
+    return initializeApp(firebaseConfig);
+  }
+  return getApp();
+}
+
+export const app = getFirebaseApp();
+export const dataConnect = getDataConnect(app, connectorConfig);
+export const auth = getAuth(app);