sousa-gecko/services/sync/docs/rust-engines.md

How Rust Engines are implemented

There are two main components to engines implemented in Rust

The bridged-engine

Because Rust engines still need to work with the existing Sync infrastructure, there's the concept of a {searchfox}bridged-engine <services/sync/modules/bridged_engine.sys.mjs>. In short, this is just a shim between the existing {searchfox}Sync Service <services/sync/modules/service.sys.mjs> and the Rust code.