Javascript-SDK - 6.4.0

Feature Rollout: Added support for Feature Rollouts, a new experiment type combining Targeted Delivery simplicity with A/B test measurement capabilities. Feature Rollouts enable progressive rollouts with full impact analytics, metric tracking, and confidence intervals. See Feature Rollout docsFeature Rollout docs for more information.

https://github.com/optimizely/javascript-sdk/releases/tag/v6.4.0