Flutter provider clearing up how to#
Flutter provider clearing up generator#

Starting Build Updating asset graph completed, took 0 ms Running build completed, took 309 ms Caching finalized dependency graph completed, took 12 ms Succeeded after 323 ms with 4 outputs ( 16 actions ) In practice, I've observed that flutter pub run build_runner watch is fast (at least on small projects) and produces sub-second updates after the first build:

Flutter provider clearing up generator#

CI build workflows need to run the code generator before compiling the app (leading to longer builds that cost you more build minutes).

other team members need to always be running flutter pub run build_runner watch during development.

gitignore to exclude all generated files from our repository. If we don't want that, we can add *.g.dart to. If we add the generated files to version control, they will show up on Pull Requests every time they change: GitHub diff showing the auto-generated provider file The drawbacks of Riverpod Generator all boil down to one thing: code generation.Įven the simplest provider produces 15 lines of generated code in a separate file, which can slow down the build process and clutter our project with extra files. When modifying the source code of a provider, on hot-reload Riverpod will re-execute that provider and only that provider. Advantage: stateful hot-reload for providers This is a sensible choice since we shouldn't hold on to the state of providers that are no longer in use.Īnd as I have explained in my Riverpod 2.0 guide, we can tweak the dispose behaviour by calling ref.keepAlive() and even implement a timeout-based caching strategy if needed. With the new syntax, all the generated providers use autoDispose by default. This makes runtime type errors less likely since our code won't compile if we don't use the correct types in the first place.

moviesRepository() → moviesRepositoryProvider and MoviesRepositoryRef.

The new syntax also makes it easy to declare complex providers that take one or more arguments (such as the FutureProvider.family we have seen above).Īnother bonus is that the generated code creates a new specialized type for each 'ref' object, and this can be easily inferred from the function name: The biggest advantage is that we no longer have to figure out which kind of provider we need ( Provider vs FutureProvider vs StreamProvider etc.) since the code generator will figure it out from the function signature. Advantage: auto-generate the right kind of provider Now that we've learned about the new syntax and how the generator works, let's summarize the pros and cons.

Flutter provider clearing up how to#

On one hand, you may have simple providers such as Future movie ( MovieRef ref, įor more details on how to customise the caching behaviour using keepAlive, read: Caching with Timeout. If you're new to Riverpod, read: Flutter Riverpod 2.0: The Ultimate Guide Should we write providers by hand? This article assumes that you're already familiar with Riverpod. We'll also cover some tradeoffs, so you can decide if you should use the new syntax in your own apps. Update: a third article is also available, showing how to boost your workflow with Riverpod Lint & Riverpod Snippets. You can find the second article here: How to use Notifier and AsyncNotifier with the new Flutter Riverpod Generator. pass arguments to a provider, overcoming the limitations of the old family modifierĪnd in the next article, we'll learn how to generate providers from classes, and see on how to completely replace StateNotifierProvider and StateProvider with the new Notifier and AsyncNotifier classes.

convert FutureProvider to the new syntax.In this first article, we'll learn how to generate providers from functions using the new syntax. There is much to cover, so I'll break this into two articles. RevenueCat gives you everything you need to build, analyze, and grow IAPs with just a few lines of code. Help me keep it that way by checking out this sponsor:Īdd subscriptions to your Flutter apps.