Manganis

Manganis is a tool for submitting assets and native source files to the program linker. It makes it easy to self-host assets and native plugins that are distributed throughout your libraries.

Assets

Including assets is as simple as using the asset!() macro:

use manganis::{Asset, asset};
const STYLE: Asset = asset!("/assets/style.css");

After cargo builds your app, the asset path is embedded directly in the data section. A tool like the Dioxus CLI can extract this metadata and post-process these assets.

use manganis::{ImageFormat, Asset, asset, ImageSize, AssetOptions};
// You can collect arbitrary files. Absolute paths are resolved relative to the package root
const _: Asset = asset!("/assets/script.js");

// You can collect images which will be automatically optimized
pub const PNG_ASSET: Asset =
    asset!("/assets/image.png");
// Resize the image at compile time to make the assets smaller
pub const RESIZED_PNG_ASSET: Asset =
    asset!("/assets/image.png", AssetOptions::image().with_size(ImageSize::Manual { width: 52, height: 52 }));
// Or convert the image at compile time to a web friendly format
pub const AVIF_ASSET: Asset = asset!("/assets/image.png", AssetOptions::image().with_format(ImageFormat::Avif));

option_asset

If you have assets that may not always be bundled, you can fall back gracefully with option_asset!:

use manganis::{Asset, asset, option_asset};
const REQUIRED: Asset = asset!("/assets/style.css");
const OPTIONAL: Option<Asset> = option_asset!("/assets/missing.css");

Native FFI Bindings

Manganis provides the #[ffi] attribute macro for generating direct FFI bindings between Rust and native platforms (Swift/Kotlin). See the geolocation-native-plugin example for usage.