Unleash Node.js Client

The `unleash-client` package provides a server-side SDK for Node.js applications to integrate with the Unleash feature management platform. It enables dynamic evaluation of feature flags, allowing developers to control feature rollouts, perform A/B testing, and manage configurations without redeploying code. The current stable version is 6.11.1, with frequent patch and minor releases addressing bug fixes, performance improvements, and new constraint types (like semver and CIDR). This client is designed for high performance and low overhead, maintaining an in-memory repository of feature toggles that are polled from the Unleash server at regular intervals. It supports both Unleash Enterprise and Open Source instances and is suitable for applications requiring robust and scalable feature flag capabilities. Key differentiators include its focus on server-side evaluation, asynchronous initialization with event-driven readiness signals, and support for various constraint types.