feat(lura-js): add generation for functions

lura-js/src/lib.rs

@@ -1,7 +1,8 @@
 use std::{path::Path, rc::Rc};
 
 use deno_core::{error::AnyError, FastString};
-use eyre::{bail, eyre};
+use eyre::bail;
+use lura_hir::source::declaration::Declaration;
 use lura_hir::source::top_level::TopLevel;
 use lura_hir::{
   solver::Definition,
@@ -55,12 +56,17 @@ pub fn walk_on_expr<'a>(db: &dyn HirDb, expr: Expr) -> js::Expr<'a> {
 }
 
 pub fn transform_top_level(db: &dyn HirDb, top_level: TopLevel) -> eyre::Result<js::ProgramPart> {
-  let _ = db;
   match top_level {
     TopLevel::Error(_) => bail!("errors are not supported"),
     TopLevel::Using(_) => bail!("using are not supported"),
     TopLevel::Command(_) => bail!("commands are not supported"),
-    TopLevel::BindingGroup(_) => bail!("binding declarations are not supported"),
+    TopLevel::BindingGroup(group) => Ok(js::ProgramPart::decl(js::Decl::Func(js::Func {
+      id: Some(js::Ident::new(group.name(db).to_string(db))),
+      params: vec![],
+      body: js::FuncBody(vec![]),
+      generator: false,
+      is_async: false,
+    }))),
     TopLevel::ClassDecl(_) => bail!("class declarations are not supported"),
     TopLevel::InstanceDecl(_) => bail!("instance declarations are not supported"),
     TopLevel::TraitDecl(_) => bail!("trait declarations are not supported"),