tauri-plugins-workspace/plugins/store/examples/AppSettingsManager/src-tauri/src/main.rs

// Prevents additional console window on Windows in release, DO NOT REMOVE!!
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use tauri_plugin_store::StoreBuilder;

mod app;
use app::settings::AppSettings;

fn main() {
    tauri::Builder::default()
        .plugin(tauri_plugin_store::Builder::default().build())
        .setup(|app| {
            // Init store and load it from disk
            let mut store = StoreBuilder::new(app.handle(), "settings.json".parse()?).build();

            // If there are no saved settings yet, this will return an error so we ignore the return value.
            let _ = store.load();

            let app_settings = AppSettings::load_from_store(&store);

            match app_settings {
                Ok(app_settings) => {
                    let theme = app_settings.theme;
                    let launch_at_login = app_settings.launch_at_login;

                    println!("theme {}", theme);
                    println!("launch_at_login {}", launch_at_login);

                    Ok(())
                }
                Err(err) => {
                    eprintln!("Error loading settings: {}", err);
                    // Handle the error case if needed
                    Err(err) // Convert the error to a Box<dyn Error> and return Err(err) here
                }
            }
        })
        .run(tauri::generate_context!())
        .expect("error while running tauri application");
}