use proc_macro2::TokenStream;
use quote::quote;
use crate::{ctxt::Ctxt, decl::TsTypeAliasDecl, typescript::TsType};
pub fn expend(item: syn::ItemType) -> darling::Result<TokenStream> {
let ctxt = Ctxt::new();
let type_ann = TsType::from(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,
};
let decl_str = decl.to_string();
let typescript_custom_section = quote! {
#[automatically_derived]
const _: () = {
use wasm_bindgen::prelude::*;
#[wasm_bindgen(typescript_custom_section)]
const TS_APPEND_CONTENT: &'static str = #decl_str;
};
};
ctxt.check()?;
let tokens = quote! {
#item
#typescript_custom_section
};
Ok(tokens)
}