Add use_js macro

[mcmah309]

This macro does compile time validation and creates rust bindings to javascript functions. Works like a regular use import statement. See example: https://github.com/DioxusLabs/dioxus/blob/40e21cb221754665c68473890360512ac23821f5/examples/use_js_macro.rs

example statement:

use_js!("examples/assets/example.js"::greeting);
// use_js!("examples/assets/example.js"::{ greeting, });
// use_js!("examples/assets/example.js"::*);

example macro expansion:

// Recursive expansion of use_js! macro
// =====================================

#[doc = " "]
#[doc = " This is a doc comment"]
#[doc = " second line"]
pub async fn greeting(
    from: impl serde::Serialize,
    to: impl serde::Serialize,
) -> Result<serde_json::Value, document::EvalError> {
    const MODULE: Asset = {
        const __ASSET_SOURCE_PATH: &'static str = "/workspaces/dioxus/examples/assets/example.js";
        const __ASSET_OPTIONS: manganis::AssetOptions =
            manganis::AssetOptions::Unknown.into_asset_options();
        const __ASSET_HASH: &'static str = "de4b2e9e300415dc";
        const __ASSET: manganis::BundledAsset =
            manganis::macro_helpers::create_bundled_asset(__ASSET_SOURCE_PATH, __ASSET_OPTIONS);
        const __BUFFER: manganis::macro_helpers::const_serialize::ConstVec<u8> =
            manganis::macro_helpers::serialize_asset(&__ASSET);
        const __BYTES: &[u8] = __BUFFER.as_ref();
        const __LEN: usize = __BYTES.len();
        #[unsafe(export_name = "__MANGANIS__de4b2e9e300415dc")]
        static __LINK_SECTION: [u8; __LEN] = manganis::macro_helpers::copy_bytes(__BYTES);
        static __REFERENCE_TO_LINK_SECTION: &'static [u8] = &__LINK_SECTION;
        manganis::Asset::new(__REFERENCE_TO_LINK_SECTION)
    };
    let js = alloc::__export::must_use({
        let res = alloc::fmt::format(alloc::__export::format_args!("const {{ greeting }} = await import(\"{}\");\nlet from = await dioxus.recv();\nlet to = await dioxus.recv();\nreturn greeting(from, to);",MODULE));
        res
    });
    let eval = document::eval(js.as_str());
    eval.send(from)?;
    eval.send(to)?;
    eval.await
}

closes #4302

[jkelleyrtp]

Thanks for the PR! We definitely need a better FFI solution in dioxus, but I want to wait until 0.7 is shipped before we start exploring the design space. So, sadly this PR might sit for a while.

We want a similar solution for:

• Java
• Kotlin
• Swift
• Objective C
• C/C++
• TypeScript

It would be ideal to wrap all this under a single interface and build system (ie maybe through buck2/bazel ?) and then integrated with dx. We probably aren't going to accept any adhoc system until then.

[mcmah309]

Thanks for the feedback. Do you think this might be a better fit in the sdk in the meantime or as a standalone repo/crate I own? I definitely will be using it until something comparable is implemented