Andrew Stewart upgraded the asset management workflow in the phoenixframework/phoenix repository to support ES2022, focusing on both configuration management and documentation. He updated the asset management guide and configuration files, enabling the use of newer JavaScript features and streamlining the asset build process. Working primarily with Elixir and Markdown, Andrew ensured that the documentation and configuration were fully aligned with the ES2022 standard, which improves maintainability and prepares the frontend stack for modern tooling. The work, delivered as a single, traceable commit, addressed technical debt and positioned the asset pipeline for smoother future feature delivery and easier upgrades.