Charles Capon developed Angular 21 support for the open-feature/js-sdk repository, focusing on modernizing the SDK’s dependency management and ensuring seamless compatibility with the latest Angular features. He updated core dependencies, including Angular and ESLint, and integrated @angular-eslint to align with Angular 21’s ecosystem. Working primarily with JavaScript and JSON, Charles addressed compatibility issues, notably resolving issue #1314 to enhance stability and user experience. His work emphasized reducing upgrade friction for downstream applications, providing a smoother upgrade path and lowering maintenance overhead. The depth of his contribution lay in validating the SDK’s compatibility and improving long-term support for customers.