Add one-time Effect fields to Flutter Cubit/Bloc state for UI actions.
npx skills add https://github.com/marcglasberg/bloc_superpowers --skill add-effect
Please help me install this Agent Skill. Skill: add-effect Source: https://github.com/marcglasberg/bloc_superpowers/tree/main/.claude/skills/add-effect Command: npx skills add https://github.com/marcglasberg/bloc_superpowers --skill add-effect
State management for Flutter/Cubit often needs one-time side effects (snackbars, dialogs, navigation) that should trigger only once. This skill provides typed and untyped Effect fields in state to model and emit such one-time actions, ensuring consumption after read.
Define an Effect field in your state class, initialize it as spent, emit a new Effect value when you want to trigger a one-time UI action, and consume it in the widget with context.effect().
High-intent search queries and answers about installing and using this skill.
One-time UI effects in Flutter Cubit state can be triggered by adding Effect fields to your state class. You initialize the Effect as spent, emit a new Effect value to trigger the action, and consume it in the widget using context.effect().
The best way to show a snackbar once is using typed Effect fields in your state to model the one-time notification. Emitting an Effect value from the Cubit ensures the snackbar triggers exactly once, as the effect is consumed after being read by context.effect().
Yes, this state management pattern supports both typed Effect<T> and untyped Effect fields. Typed fields provide specific one-time UI actions like navigation, while untyped fields handle generic transient actions, ensuring safe consumption via context.effect().
To safely consume one-time effects in Flutter, use a single-consumer pattern for each effect and wrap UI actions like dialogs or navigation in addPostFrameCallback. This ensures the context.effect() consumption happens safely after the current build frame.
Side effects trigger multiple times because standard state fields are continuously read during widget rebuilds. Using spent Effect initialization and consuming the Effect via context.effect() ensures the one-time UI action is only triggered and read exactly once.
hnvcamGuide Flutter state management implementation and testing with bloc and flutter_bloc libraries.
marcglasbergConsume one-time Effect<T> fields from state using context.effect() in widget builds.
NNPopovImplement Flutter state management with Bloc and Cubit patterns.
marcglasbergMigrate BlocListener side effects to explicit Effects in Cubit state using context.effect().
