feat: simple tests passing

packages/core/src/component.rs

@@ -2,6 +2,44 @@
 //     fn into_component_type(self) -> ComponentType;
 // }
 
+use futures_util::Future;
+
 use crate::{element::Element, scopes::Scope};
 
-pub type Component<T = ()> = fn(&Scope<T>) -> Element;
+pub type Component<T = ()> = fn(Scope<T>) -> Element;
+
+pub enum ComponentFn<T, F: Future<Output = ()> = Dummy> {
+    Sync(fn(Scope<T>) -> Element),
+    Async(fn(Scope<T>) -> F),
+}
+
+pub trait IntoComponent<T, A = ()> {
+    fn into_component(self) -> ComponentFn<T>;
+}
+
+impl<T> IntoComponent<T> for fn(Scope<T>) -> Element {
+    fn into_component(self) -> ComponentFn<T> {
+        ComponentFn::Sync(self)
+    }
+}
+
+pub struct AsyncMarker;
+impl<'a, T, F: Future<Output = Element<'a>>> IntoComponent<T, AsyncMarker>
+    for fn(&'a Scope<T>) -> F
+{
+    fn into_component(self) -> ComponentFn<T> {
+        todo!()
+    }
+}
+
+pub struct Dummy;
+impl Future for Dummy {
+    type Output = ();
+
+    fn poll(
+        self: std::pin::Pin<&mut Self>,
+        cx: &mut std::task::Context<'_>,
+    ) -> std::task::Poll<Self::Output> {
+        unreachable!()
+    }
+}