Escaping the Fork: How Meta Modernized WebRTC Across 50+ Use Cases

Meta escaped the "forking trap" by migrating from a divergent WebRTC fork to a modular upstream-based architecture, enabling continuous upgrades while serving billions of users.

• •Built a dual-stack shim layer running legacy and latest WebRTC versions simultaneously for A/B testing across 50+ use cases
• •Resolved C++ symbol collisions through automated renamespacing (webrtc_legacy:: and webrtc_latest::) and namespace manipulation
• •Addressed macro conflicts by removing spurious includes, renaming macros, and sharing internal modules across versions
• •Implemented template-based helpers for runtime version dispatch while maintaining backward compatibility
• •Automated shim generation using AST parsing, increasing velocity from one shim per day to three or four