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Fixing `Undefined name 'required' used as an annotation.` in Dart

I saw the `@required` annotation in a Firebase Auth method signature, and tried to override it. However in my project it threw this error: Undefined name 'required' used as an annotation. Try defining the name or importing it from another library.dart(undefined_annotation)

Today's random error: `FLTFirebaseCorePlugin.m:6:9: fatal error: 'UserAgent.h' file not found`

Today I tried to compile a Flutter app to iOS for the first time. After setting up the signing key in XCode, I ran flutter build ios and got the following error: ~/flutter/.pub-cache/hosted/pub.dartlang.org/firebase_core-0.4.4+2/darwin/

dart web

Fixing `Uncaught TypeError: Instance of 'eD': type 'eD' is not a subtype of type 'minified:cV'`

After updating a bunch of dependencies in my project, I tested it in dev mode with webdev serve, and it worked fine. So I compiled it with webdev build and released it, only to find out that this time, things broke: Uncaught TypeError: Instance

dart web

Fixing `CastError: Instance of 'minified:aR<String, dynamic>': type 'minified:aR<String, dynamic>' is not a subtype of type 'minified:b0'`

After I updated my package dependencies on a project I had not run for a long time, I tested it in debug mode using webdev serve. Things ran fine! So I proceeded to deploy it to production with webdev build. This time, upon running

dart web

Fixing `Method not found: 'promiseToFuture'.`

I tried to run a Dart Web project I hadn't touched for a while, and after updating my dependencies and running it, I got this: [SEVERE]build_web_compilers:ddc on package:firebase/src/app.ddc.module (cached): Error compiling dartdevc module:firebase|lib/

flutter

Integrating Firebase Auth and Google Sign-in in Flutter Web

I have a Flutter app that uses Firebase Auth with Google Sign-in. I use it in Android and Firebase fine. Today I wanted to run it on web as well. I set up the project to support web (see post). Then I went to

Running an existing Flutter app on Web

My starting point was flutter.io. On the main page, I clicked on "web", went to https://flutter.dev/web, then to https://flutter.dev/docs/get-started/web. The requirements say that you have to be on the beta branch: flutter channel beta flutter

Fixing `Error when reading 'bin/main.dart': No such file or directory`

Sometimes when I try to launch my Flutter app, Visual Studio Code throws this at me: bin/main.dart: Error: Error when reading 'bin/main.dart': No such file or directory Exited (sigint) The fix is to open ./vscode/launch.json and to remove

dart

Ignoring lint warnings in Dart

Sometimes the Dart compiler warns you about a potential mistake that is actually intentional: line 19 col 37: The value of the field '_delegate' isn't used. The message above is a "health tip" that pub.dev left on my package, but it doesn't

Flutter unit tests now run in random order

Earlier, I ran `flutter test` and was pleased to see this: % flutter test Shuffling test order with --test-randomize-ordering-seed=0 This is great! It'll prevent developers from accidentally writing order dependent tests.

flutter

Hero works great! except with text

You can watch the 1 minute YouTube demo on the documentation: Hero class - widgets library - Dart APIAPI docs for the Hero class from the widgets library, for the Dart programming language.Dart APIThere's also a full page that goes in-depth about the

Running Flutter Desktop on MacOS

Flutter Desktop used to be a separate experimental project, and it was moved to the flutter GitHub repository recently as it has gotten more mature. The doc says that it is easiest to run a Flutter desktop app on MacOS, but that it still

Fixing iOS distribution certificate related errors

When trying to deploy my app with Fastlane to the App Store, the commands have failed citing certificate related errors such as: error: exportArchive: No profiles for 'com.company.appname' were foundError Domain=IDEProfileLocatorErrorDomain Code=1 "No profiles for 'com.company.appname' were found"

Fixing `Could not determine java version from '11.0.5'.`

I was trying to run a Java application when I got this error: # ./gradlew run FAILURE: Build failed with an exception. * What went wrong: Could not determine java version from '11.0.5'. * Try: Run with --stacktrace option to get the stack trace. Run

Fixing `PlatformException (PlatformException(sign_in_failed, com.google.android.gms.common.api.ApiException: 10: , null))` when calling GoogleSignIn.signIn()

I got this issue when setting an existing project on a new machine. Based on this StackOverflow post, what I needed to do was: add my machine's Android Studio debug key to the list of whitelisted keys in Firebase's Android app.download the updated

kubernetes

Second try with Kubernetes

Last time, I got completely lost in all the different entities managed by Kubernetes. See http://blog.wafrat.com/kubernetes-is-hard/. Each entity refers to others by labels and selectors. Let's take it slow and get it right. Labels and SelectorsLabelsYou can assign labels to

kubernetes

Kubernetes is hard

It's supposed to be elegant and simplify lots of things, but right now it's just making me depressed. All this time I've been managing VMs manually. But that means I have to update Linux every once in a while, on each of them. I

ubuntu

Upgrading Ubuntu 16.4 to 18.4

Every 2 years, a new Long Term Support (LTS) version of Ubuntu is released. The latest LTS version is 18.4. The VM running this blog was running on 16.4, so it was time to upgrade. Run these 4 commands. Super easy!Most

Webapp serving guide

My goal is to streamline the deployment and serving of webapps. Why should I upgrade linux every once in a while, remember to update packages, etc? BlogYou could go for a hosted solution like Ghost's. But it's ridiculously expensive. $30/mo for the smallest

Exploring IMDB reviews in TensorFlow Datasets

Running demo colabs and watching online courses are fine, but the only way for me to really understand the details is by doing it myself. Loading the datasetLet's start by loading the dataset. First I looked at the docs at https://www.tensorflow.org/

Handling `The default version of TensorFlow in Colab will soon switch to TensorFlow 2.x.`

I started a Colab notebook from scratch and imported TensorFlow, expecting to get version 2. Somehow I get this message: The default version of TensorFlow in Colab will soon switch to TensorFlow 2.x.We recommend you upgrade now or ensure your notebook will

`flutter pub update` didn't update my packages?

pub.dev warned me that one of my packages wasn't correctly overriding a method. It even gave me a -20 points to health. line 118 col 9: 'MockCollectionReference.where' ('Query Function(dynamic, {arrayContains: dynamic, isEqualTo: dynamic, isGreaterThan: dynamic, isGreaterThanOrEqualTo: dynamic, isLessThan: dynamic, isLessThanOrEqualTo: dynamic,

Fixing iOS compile issues in Flutter

I am not an iOS developer, so CocoaPods errors are foreign to me. I'll document the common errors I get and how I fixed them for future reference. Once I tried to compile my app, and suddenly I got these errors: [!] CocoaPods could not

flutter

How to write unit tests with Firebase in Flutter

I've recently published a few packages to help write unit tests for Flutter apps that use Firebase. This includes Firestore, Firebase Storage, Firebase Authentication with Google Sign In. Quick links to the packageshttps://pub.dev/packages/cloud_firestore_mockshttps://pub.dev/packages/firebase_storage_

Publishing a library to pub.dev

Today I published my first ever library to pub.dev. Here's how it went. Creating a verified publisherI went to pub.dev and signed in. Once signed in, you can create a verified publisher. Verified publishers are based on a domain name and packages