docs: feature-flag plugin design & phased build plan#1009
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Research-backed design doc for a SonicJS feature-flag plugin (LaunchDarkly / Unleash / Flagsmith / GrowthBook / Statsig parity), built on the document model. 7 phases (0-6): MVP at Phase 2, terminal "highly complex" A/B experimentation engine at Phase 6. Dual consumer (internal gating + external service), full multi-project/env, MurmurHash3-32 bucketing, OpenFeature provider, D1 + 3-tier cache edge delivery. Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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What
Adds a research-backed design doc for a SonicJS feature-flag plugin — LaunchDarkly / Unleash / Flagsmith / GrowthBook / Statsig parity, built entirely on the document model (no new feature tables).
docs/ai/plans/feature-flag-plugin-plan.mdWhy
Proposal to make SonicJS usable as a feature-flag / progressive-delivery platform, serving both internal feature gating (
FlagService.isEnabled) and external apps (SDK keys,/flagsAPI, OpenFeature provider).Highlights
{value, variant, reason}mapped to OpenFeature vocabulary.bucketBy+ per-flag salt).CacheService(memory→KV→D1) + versioned polling. SSE streaming documented as optional stretch.Scope
Docs only — no code, no schema, no migrations. This is the design/roadmap for review before implementation.
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