in my script.js
import { initializeApp } from "https://www.gstatic.com/firebasejs/9.4.1/firebase-app.js";
import { getDatabase, ref, set, child, get } from "https://www.gstatic.com/firebasejs/9.4.1/firebase-database.js";
// Initialize Firebase
const app = initializeApp(firebaseConfig);
const db = getDatabase(app);
const dbRef = ref(db);
is showing error SyntaxError: Cannot use import statement outside a module how do I solve this
It sounds like you're using import in a script, not a module. The distinction is in how the environment was told to load the file.
In a browser, you need type="module" on the script tag:
<script src="./script.js" type="module"></script>
More on MDN.
On Node.js, you need "type": "module" in your package.json or the .mjs extension, see the Node.js documentation for details.