Add lazy contexts to signals

packages/hooks/src/lib.rs

@@ -79,3 +79,6 @@ pub use usecallback::*;
 
 mod usememo;
 pub use usememo::*;
+
+mod userootcontext;
+pub use userootcontext::*;

packages/hooks/src/userootcontext.rs

@@ -0,0 +1,9 @@
+use dioxus_core::ScopeState;
+
+///
+pub fn use_root_context<T: 'static + Clone>(cx: &ScopeState, new: impl FnOnce() -> T) -> &T {
+    cx.use_hook(|| {
+        cx.consume_context::<T>()
+            .unwrap_or_else(|| cx.provide_root_context(new()))
+    })
+}