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# 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.