tsify-macros 0.5.6

Macros for tsify
Documentation 
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use proc_macro2::TokenStream;
use quote::quote;

use crate::{
    attrs::TypeGenerationConfig, comments::extract_doc_comments, decl::TsTypeAliasDecl,
    error_tracker::ErrorTracker, typescript::TsType,
};

/// Expand a `#[declare]` macro on a Rust `type = ...` expression.
pub fn expand(item: syn::ItemType) -> syn::Result<TokenStream> {
    let errors = ErrorTracker::new();

    let type_ann = TsType::from_syn_type(&TypeGenerationConfig::default(), item.ty.as_ref());

    let decl = TsTypeAliasDecl {
        id: item.ident.to_string(),
        export: true,
        type_params: item
            .generics
            .type_params()
            .map(|ty| ty.ident.to_string())
            .collect(),
        type_ann,
        comments: extract_doc_comments(&item.attrs),
    };

    let decl_str = decl.to_string();

    let typescript_custom_section = quote! {
        const _: () = {
            use wasm_bindgen::prelude::*;
            #[wasm_bindgen(typescript_custom_section)]
            const TS_APPEND_CONTENT: &'static str = #decl_str;
        };
    };

    errors.check()?;

    let tokens = quote! {
      #item
      #typescript_custom_section
    };

    Ok(tokens)
}