How to set up flutter_rust_bridge in an existing Flutter project?

Run the one-liner command `cargo install flutter_rust_bridge_codegen && flutter_rust_bridge_codegen create my_app` from the README, then integrate the generated code. For existing projects, you'll need to manually configure the Rust crate and update build scripts, as detailed in the documentation.

Flutter Rust Bridge vs direct FFI: which should I use?

Flutter Rust Bridge automates boilerplate for complex type serialization, async support, and two-way calls, saving development time. Direct FFI is better for low-level control or simple interfaces, but requires manual memory management and more code.

Can I use async Rust functions with Flutter's async Dart?

Yes, the bridge supports async Rust functions that can be called from async Dart, allowing non-blocking operations. The README highlights this in the 'Async & sync' features with examples like async search functions.

What types of errors does flutter_rust_bridge handle?

It automatically translates Rust Result types to Dart exceptions, providing error propagation. Custom errors can be defined, and the bridge ensures memory safety during error handling as part of its reliability guarantees.

Is flutter_rust_bridge ready for production apps?

Yes, it's used by many projects, has solid CI with sanitizers, and is a Flutter Favorite. However, experimental features may require caution, and testing on all target platforms is recommended due to the cross-platform nature.

How do I debug Rust code when called from Flutter?

Use standard Rust debugging tools like println! or a debugger, as the bridge integrates with existing Flutter and Rust toolchains. The README mentions that Flutter debuggers and Rust libraries work without interference.

Open-Awesome

flutter_rust_bridge

MITDartv2.14.0-beta.1

A feature-rich, seamless binding generator for calling Rust code from Flutter/Dart and vice versa.

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5.4k stars419 forks0 contributors

What is flutter_rust_bridge?

Flutter Rust Bridge is a binding generator that automatically creates glue code to call Rust functions from Flutter/Dart applications and vice versa. It solves the problem of integrating high-performance Rust libraries or algorithms into Flutter's cross-platform UI, enabling developers to leverage Rust's speed and safety without manual FFI boilerplate.

Target Audience

Flutter developers who need to incorporate high-performance Rust code (e.g., for algorithms, data-intensive operations, or existing Rust libraries) into their mobile or desktop apps, and Rust developers seeking a UI framework for their Rust systems.

Value Proposition

It offers a seamless, feature-rich integration with support for arbitrary types, async/await, two-way calls, and cross-platform compatibility, all while being officially recognized as a Flutter Favorite package with a strong focus on safety and developer experience.

Overview

Flutter/Dart <-> Rust binding generator, feature-rich, but seamless and simple.

Use Cases

Best For

Adding high-performance Rust algorithms or data processing to Flutter apps
Using existing Rust crates (libraries) in a Flutter/Dart project
Building Flutter UI frontends for Rust-based systems or backends
Writing CPU-intensive or multi-threaded code in Rust for Flutter mobile apps
Creating cross-platform apps that require both a rich UI and native performance
Integrating Rust's memory safety and reliability into Flutter development workflows

Not Ideal For

Projects building simple UI apps without performance-critical backend logic
Teams lacking Rust expertise and unwilling to invest in learning the language
Rapid prototyping where Flutter's Dart ecosystem alone is sufficient for MVP
Apps requiring frequent hot-reload cycles without Rust compilation overhead

Pros & Cons

Pros

Flutter Favorite Status

Officially recognized as a Flutter Favorite package, ensuring high quality, community trust, and alignment with Flutter best practices, as noted in the README.

Arbitrary Type Support

Handles complex Rust and Dart types like enums, structs, streams, and errors without manual serialization, enabling natural code writing as demonstrated in the examples.

Async and Two-Way Communication

Supports async Rust, sync Rust, async Dart, and sync Dart interoperability, plus Rust-to-Dart callbacks, allowing flexible and non-blocking integration.

Cross-Platform Coverage

Works on Android, iOS, Windows, Linux, macOS, and Web, providing broad platform support for combining Rust and Flutter in diverse environments.

Cons

Experimental Feature Risk

Key features like parsing third-party packages and lifetimes are labeled experimental in the README, which may lead to instability or breaking changes in production use.

Dual Ecosystem Complexity

Requires proficiency in both Rust and Flutter/Dart, increasing the learning curve and toolchain setup overhead compared to single-language solutions.

Code Generation Dependency

Relies on generated glue code that must be regenerated on API changes, adding a build step and potential for integration issues if not managed carefully.

Frequently Asked Questions

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