This compiler compiles capnp files to be used in dart projects. As described by robo fiddle below, the compiler generates output that makes the capnp-dart package usable in dart/flutter projects.
Compile the rust project with cargo build --release- this is to create the compiler which you will use to create the capnp files. Don't alter the files produced by this compiler.
Coupled with https://github.com/roboFiddle/capnp-dart