Show HN: Node.js type-safe dynamic config with real-time updates (MIT) (github.com)

NodeJS TypeScript client for watching configuration values with real-time updates. Zero runtime deps, works in Node 18+. Override rules are evaluated client-side so user context never leaves your app.

Use it for feature flags, rate limits, timeouts, kill switches—anything you'd rather change without a deploy. Changes propagate in under a second. Roll back instantly if something breaks.

npm: https://www.npmjs.com/package/@replanejs/sdk

GitHub: https://github.com/replane-dev/replane-javascript/tree/main/...