Installing dependencies

Next, we need to install a few build-time and runtime dependencies.

Build-time dependencies

These depdencies are required only in build-time:

• flutter_rust_bridge_codegen, the core codegen for Rust-Dart glue code
• ffigen, to generate Dart code from C headers
• A working installation of LLVM, see Installing LLVM, used by ffigen
• (Optional) cargo-xcode, if you want to generate Xcode projects for iOS and MacOS

An easy way to install most of these dependencies is to run:

• dart project

  cargo install flutter_rust_bridge_codegen
  dart pub add --dev ffigen && dart pub add ffi
  # if building for iOS or MacOS
  cargo install cargo-xcode
  

• flutter project

  cargo install flutter_rust_bridge_codegen
  flutter pub add --dev ffigen && flutter pub add ffi
  # if building for iOS or MacOS
  cargo install cargo-xcode
  

Alternatively, each of these dependencies may provide prebuilt binaries. Check with your package manager and review them individually.

Dart dependencies

On the Dart side, flutter_rust_bridge is the required runtime component of flutter_rust_bridge_codegen. If you plan to use enum structs in Rust, the following dependencies are also needed:

• build_runner (dev)
• freezed (dev)
• freezed_annotation

Their usage is explained in Using build_runner.

flutter pub add flutter_rust_bridge
# if using Dart codegen
flutter pub add -d build_runner
flutter pub add -d freezed
flutter pub add freezed_annotation

Rust dependencies

Similar to Dart, Rust requires the flutter_rust_bridge runtime component for support.

Add these lines to Cargo.toml:

+[dependencies]
+flutter_rust_bridge = "1"