add must use to several hooks

packages/hooks/src/computed.rs

@@ -37,6 +37,7 @@ use std::{
 ///    }
 /// }
 /// ```
+#[must_use]
 pub fn use_tracked_state<T: 'static>(cx: &ScopeState, init: impl FnOnce() -> T) -> &Tracked<T> {
     cx.use_hook(|| {
         let init = init();
@@ -160,6 +161,7 @@ impl<I> Drop for Tracker<I> {
     }
 }
 
+#[must_use = "Consider using the `use_effect` hook to rerun an effect whenever the tracked state changes if you don't need the result of the computation"]
 pub fn use_selector<I: 'static, O: Clone + PartialEq + 'static>(
     cx: &ScopeState,
     tracked: &Tracked<I>,

packages/hooks/src/use_callback.rs

@@ -24,6 +24,8 @@ macro_rules! use_callback {
         )
     };
 }
+
+#[must_use]
 pub fn use_callback<T, R, F>(cx: &ScopeState, make: impl FnOnce() -> R) -> impl FnMut(T) + '_
 where
     R: FnMut(T) -> F + 'static,

packages/hooks/src/use_context.rs

@@ -3,6 +3,7 @@ use dioxus_core::ScopeState;
 /// Consume some context in the tree, providing a sharable handle to the value
 ///
 /// Does not regenerate the value if the value is changed at the parent.
+#[must_use]
 pub fn use_context<T: 'static + Clone>(cx: &ScopeState) -> Option<&T> {
     cx.use_hook(|| cx.consume_context::<T>()).as_ref()
 }

packages/hooks/src/use_coroutine.rs

@@ -79,6 +79,7 @@ where
 /// Get a handle to a coroutine higher in the tree
 ///
 /// See the docs for [`use_coroutine`] for more details.
+#[must_use]
 pub fn use_coroutine_handle<M: 'static>(cx: &ScopeState) -> Option<&Coroutine<M>> {
     cx.use_hook(|| cx.consume_context::<Coroutine<M>>())
         .as_ref()

packages/hooks/src/use_future.rs

@@ -17,6 +17,7 @@ use crate::{use_state, UseState};
 /// will be canceled before the new one is started.
 ///
 /// - dependencies: a tuple of references to values that are PartialEq + Clone
+#[must_use = "Consider using `cx.spawn` to run a future without reading its value"]
 pub fn use_future<T, F, D>(
     cx: &ScopeState,
     dependencies: D,

packages/hooks/src/use_memo.rs

@@ -28,6 +28,7 @@ use crate::UseFutureDep;
 ///     render!(Calculator { number: 0 })
 /// }
 /// ```
+#[must_use = "Consider using `use_effect` to run rerun a callback when dependencies change"]
 pub fn use_memo<T, D>(cx: &ScopeState, dependencies: D, callback: impl FnOnce(D::Out) -> T) -> &T
 where
     T: 'static,

packages/hooks/src/use_ref.rs

@@ -110,6 +110,7 @@ use std::{
 ///     }
 /// })
 /// ```
+#[must_use]
 pub fn use_ref<T: 'static>(cx: &ScopeState, initialize_refcell: impl FnOnce() -> T) -> &UseRef<T> {
     let hook = cx.use_hook(|| UseRef {
         update: cx.schedule_update(),

packages/hooks/src/use_shared_state.rs

@@ -158,6 +158,7 @@ impl<T> ProvidedStateInner<T> {
 /// Any time a component calls `write`, every consumer of the state will be notified - excluding the provider.
 ///
 /// Right now, there is not a distinction between read-only and write-only, so every consumer will be notified.
+#[must_use]
 pub fn use_shared_state<T: 'static>(cx: &ScopeState) -> Option<&UseSharedState<T>> {
     let state_owner: &mut Option<UseSharedStateOwner<T>> = &mut *cx.use_hook(move || {
         let scope_id = cx.scope_id();

packages/hooks/src/use_state.rs

@@ -30,6 +30,7 @@ use std::{
 ///     ))
 /// }
 /// ```
+#[must_use]
 pub fn use_state<T: 'static>(
     cx: &ScopeState,
     initial_state_fn: impl FnOnce() -> T,