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Implement Feature Flags with LaunchDarkly Pattern
Community April 24, 2026
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Full-featured feature flag system with targeting, percentage rollouts, and React hooks.
Prompt
Implement a feature flag system following the LaunchDarkly pattern. Include: 1. **Flag evaluation engine:** - Support flag types: boolean, string, number, JSON - User targeting by attributes (id, email, plan, country) - Percentage rollouts with consistent hashing - Rule-based targeting with AND/OR conditions - Default values when flag is not found 2. **React integration:** - FeatureFlagProvider context wrapper - useFeatureFlag(flagKey, defaultValue) hook - FeatureGate component for conditional rendering - withFeatureFlag HOC for class components 3. **Server-side evaluation:** - Middleware for API routes - Flag evaluation in server components - Edge-compatible evaluation 4. **Management:** - In-memory store with API-driven updates - Flag change event streaming - Local override for development - Analytics tracking of flag evaluations Use TypeScript throughout with proper generics.
How to Use
Use in Agent Mode. Copilot generates the full system adapted to your framework.
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