flutter-feature-flags
Use this skill when implementing Flutter feature flags — FeatureFlagService, Firebase Remote Config, A/B testing, kill switches, gradual rollout, dev/debug menu for flags, FeatureGate widget, remote feature toggles, local feature flags, or controlling feature availability per environment or user segment.
Works with
--- name: flutter-feature-flags description: Use this skill when implementing Flutter feature flags — FeatureFlagService, Firebase Remote Config, A/B testing, kill switches, gradual rollout, dev/debug menu for flags, FeatureGate widget, remote feature toggles, local feature flags, or controlling feature availability per environment or user segment. license: MIT --- # Flutter Feature Flags Full reference: [`template.md`](references/template.md) ## Key rules - `FeatureFlagService` is the app-owned interface. **Never import `firebase_remote_config`** outside `remote_config_feature_flag_service_impl.dart`. - Default values: defined at build time in the impl — Remote Config just overrides them. App works correctly without network. - `FeatureGate` widget: `FeatureGate(flag: FeatureFlags.newCheckout, child: NewWidget(), fallback: OldWidget())`. No `if (flag)` scattered in build methods. - `LocalFeatureFlagService`: in-memory impl for dev/test — allows toggling flags without Remote Config. - Dev menu: only visible when `AppConfig.env.isDev`. Shows all flags with toggles. Uses `LocalFeatureFlagService` override. - Fetch + activate Remote Config on app start in `appBootstrap()`. Set min fetch interval to 1 hour prod / 0 dev. - Kill switches: a `false` flag disables a broken feature without a release. Design every feature to have a kill switch from day 1. ## Files ``` lib/src/core/feature_flags/ feature_flag_service.dart ← interface (isEnabled(flag)) feature_flags.dart ← constants (static const String newCheckout = 'new_checkout') local_feature_flag_service.dart ← in-memory impl (dev/test) remote_config_feature_flag_service_impl.dart ← only import of firebase_remote_config feature_gate.dart ← widget (shows child or fallback based on flag) ``` ## Co-load with - `flutter-di` — register `FeatureFlagService` based on env - `flutter-flavors` — `LocalFeatureFlagService` in dev - `flutter-analytics` — log which flag variant the user sees
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