March 2026: Key deliverable focused on stabilizing real-time GraphQL subscriptions by enhancing WebSocket authentication error handling and enabling automatic token refresh. Implemented precise detection of auth errors and triggering reconnection with fresh tokens, preserving active subscriptions with no changes required to DataStore's disconnection flow. This work strengthens reliability of real-time features in aws-amplify/amplify-js and reduces token-expiry related interruptions.

January 2026: Hermes delivered Precise Floating-Point Arithmetic with sumPrecise by implementing compensated summation for Math.sumPrecise, significantly improving floating-point accuracy in JavaScript. The work aligns with the TC39 Stage 3 proposal, with a polyfill adaptation and expanded test coverage, enabling more reliable numeric computations across apps. Key PR work included review by avp and integration via Differential Revision D88690474 (PR #1779). A documented note in Features.md covers an iterator termination discrepancy observed with the polyfill. Overall, this feature reduces rounding errors in sums, supporting financial, scientific, and analytics workloads in production JavaScript applications.

September 2025 (Month: 2025-09) - Rhino (mozilla/rhino) focused on improving ES2015 iterator correctness and test coverage. Delivered a targeted fix for Array.from iteration semantics to prioritize Symbol.iterator over array-like properties, ensuring NativeArray instances are correctly included in iterator checks, and added tests to validate the behavior. This work strengthens ES2015 compatibility and reduces edge-case bugs in iteration scenarios across arrays and iterables.

Monthly summary for 2025-08 (mozilla/rhino). Delivered five ES2025 features across the Rhino engine, enhancing interoperability with modern JavaScript and improving data handling, error detection, and API capabilities. Highlights include Promise.try for NativePromise, TC39-aligned Set methods, ArrayBuffer transfer methods, Math.f16round, and Error.isError, each accompanied by focused commits and tests. These changes enable more robust synchronous-thenable handling, richer Set and ArrayBuffer APIs, improved numeric helpers, and reliable error classification. Overall impact: closer alignment with TC39 specs, better performance characteristics for data transfer, and strengthened developer ergonomics through comprehensive testing.