Issue
I tried to use firebase auth on the app, it runs fine on android emu and able to create account and login but not on web(chrome). When I run the debug it gave an error of TypeError: Cannot read properties of undefined (reading 'app'). But if I run flutter build web --release and open the web link it returns
ReferenceError: firebase is not defined. I have been google-ing for days, still unable to fix this issue. I'm at the dead-end not sure what to do. the const firebaseConfig = {...}; in the index.html was given from firebase auth when created an webapp project.
Please help. not sure where it went wrong.
flutter doctor
[√] Flutter (Channel stable, 2.5.0, on Microsoft Windows [Version 10.0.22454.1000],locale
en-US)
[√] Android toolchain - develop for Android devices (Android SDK version 31.0.0)
[√] Chrome - develop for the web
[√] Android Studio (version 2020.3)
[√] VS Code (version 1.60.2)
[√] Connected device (2 available)
flutter --version
Flutter 2.5.0 • channel stable • https://github.com/flutter/flutter.git
Framework • revision 4cc385b4b8 (2 weeks ago) • 2021-09-07 23:01:49 -0700
Engine • revision f0826da7ef
Tools • Dart 2.14.0
in the pupspec.yaml
name: login_test
description: A new Flutter project.
publish_to: 'none'
version: 1.0.0+1
environment:
sdk: ">=2.12.0 <3.0.0"
dependencies:
cupertino_icons: ^1.0.2
firebase_auth: ^3.1.1
firebase_core: ^1.6.0
flutter:
sdk: flutter
fluttertoast: ^8.0.8
form_field_validator: ^1.1.0
dev_dependencies:
flutter_lints: ^1.0.0
flutter_test:
sdk: flutter
flutter:
uses-material-design: true
in the web/index.html
<!DOCTYPE html>
<html>
<head>
<!--
If you are serving your web app in a path other than the root, change the
href value below to reflect the base path you are serving from.
The path provided below has to start and end with a slash "/" in order for
it to work correctly.
For more details:
* https://developer.mozilla.org/en-US/docs/Web/HTML/Element/base
This is a placeholder for base href that will be replaced by the value of
the `--base-href` argument provided to `flutter build`.
-->
<base href="$FLUTTER_BASE_HREF">
<meta charset="UTF-8">
<meta content="IE=Edge" http-equiv="X-UA-Compatible">
<meta name="description" content="A new Flutter project.">
<!-- iOS meta tags & icons -->
<meta name="apple-mobile-web-app-capable" content="yes">
<meta name="apple-mobile-web-app-status-bar-style" content="black">
<meta name="apple-mobile-web-app-title" content="login_test">
<link rel="apple-touch-icon" href="icons/Icon-192.png">
<title>login_test</title>
<link rel="manifest" href="manifest.json">
</head>
<body>
<!-- Firebase Configuration -->
<script type="module">
// Import the functions you need from the SDKs you need
import { initializeApp } from "https://www.gstatic.com/firebasejs/9.0.2/firebase-app.js";
// TODO: Add SDKs for Firebase products that you want to use
// https://firebase.google.com/docs/web/setup#available-libraries
import { auth } from "https://www.gstatic.com/firebasejs/9.0.2/firebase-auth.js"
// Your web app's Firebase configuration
const firebaseConfig = {
apiKey: "_________-_________",
authDomain: "_________-_________.firebaseapp.com",
projectId: "_________-_________",
storageBucket: "_________-_________.appspot.com",
messagingSenderId: "_________",
appId: "1:_________:web:_________"
};
// Initialize Firebase
const app = initializeApp(firebaseConfig);
</script>
<!-- This script installs service_worker.js to provide PWA functionality to
application. For more information, see:
https://developers.google.com/web/fundamentals/primers/service-workers -->
<script>
var serviceWorkerVersion = null;
var scriptLoaded = false;
function loadMainDartJs() {
if (scriptLoaded) {
return;
}
scriptLoaded = true;
var scriptTag = document.createElement('script');
scriptTag.src = 'main.dart.js';
scriptTag.type = 'application/javascript';
document.body.append(scriptTag);
}
if ('serviceWorker' in navigator) {
// Service workers are supported. Use them.
window.addEventListener('load', function () {
// Wait for registration to finish before dropping the <script> tag.
// Otherwise, the browser will load the script multiple times,
// potentially different versions.
var serviceWorkerUrl = 'flutter_service_worker.js?v=' + serviceWorkerVersion;
navigator.serviceWorker.register(serviceWorkerUrl)
.then((reg) => {
function waitForActivation(serviceWorker) {
serviceWorker.addEventListener('statechange', () => {
if (serviceWorker.state == 'activated') {
console.log('Installed new service worker.');
loadMainDartJs();
}
});
}
if (!reg.active && (reg.installing || reg.waiting)) {
// No active web worker and we have installed or are installing
// one for the first time. Simply wait for it to activate.
waitForActivation(reg.installing || reg.waiting);
} else if (!reg.active.scriptURL.endsWith(serviceWorkerVersion)) {
// When the app updates the serviceWorkerVersion changes, so we
// need to ask the service worker to update.
console.log('New service worker available.');
reg.update();
waitForActivation(reg.installing);
} else {
// Existing service worker is still good.
console.log('Loading app from service worker.');
loadMainDartJs();
}
});
// If service worker doesn't succeed in a reasonable amount of time,
// fallback to plaint <script> tag.
setTimeout(() => {
if (!scriptLoaded) {
console.warn(
'Failed to load app from service worker. Falling back to plain <script> tag.',
);
loadMainDartJs();
}
}, 4000);
});
} else {
// Service workers not supported. Just drop the <script> tag.
loadMainDartJs();
}
</script>
<script src="main.dart.js" type="application/javascript"></script>
</body>
</html>
Solution
You should really follow the official docs. If you follow it from the start carefully it will take you there. You'll occasionally see web-specific stuff like this:
https://firebase.flutter.dev/docs/installation/web https://firebase.flutter.dev/docs/firestore/overview#3-web-only-add-the-sdk
We use it in Flutter Web just fine using these instructions. Your index.html looks different from what's there in the docs. You probably followed a tutorial somewhere that is probably outdated now.
Answered By - Gazihan Alankus
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