GitHub Rewrites Copilot Runtime in Rust Using Copilot Itself

GitHub has migrated the GitHub Copilot runtime from TypeScript (running on Node.js and V8) to Rust, producing over 800,000 lines of production code. The migration targeted a live production system, not a prototype, and GitHub used Copilot itself throughout the process to assist with code transfer and refactoring.

The move highlights a growing pattern: AI tools are increasingly used to migrate entire production systems between technology stacks, not just to write individual functions. Rust brings memory safety, predictable performance, and lower resource overhead compared to the previous Node.js-based runtime.

Migrating the GitHub Copilot Runtime to Rust Using Copilot