Why we built a custom Rust library for Capture

The Capture team built a custom Rust library to replace third-party shell-based applications for native OS interactions. This involved porting existing macOS functionality (like 'activate-windows') to Rust and extending it to Windows, enabling higher-quality screen recording (up to 4K), faster sharing, improved error handling and monitoring, reduced application footprint (e.g., 17MB on macOS), and the addition of new features like a crop tool and audio/camera-only recording types. The integration uses Neon bindings for low-overhead calls from TypeScript to native Rust code.