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Initialization

Use #[frb(init)]​

If you want to initialize the Rust side during Flutter/Dart startup, just use #[frb(init)] annotation on functions.

For example:

#[frb(init)]
pub fn lets_init_app_here() {
    // ...
}

Indeed, the flutter_rust_bridge_codegen create already creates an init function, init_app, for you.

Remark: The function needs to be inside your Rust input folder, otherwise it is simply ignored.

Alternative approach​

Alternatively, if you do not want to use the annotation above, just simply call arbitrary Rust function as you like. There is nothing special about initialization compared to normal execution.

For example:

Future<void> main() async {
  await RustLib.init();
  await myRustInitLogic(); // or `sync` if you like
  // ...
}
fn my_rust_init_logic() {
    // initialize whatever things here
}