move hooks out of signals crate

packages/hooks/src/use_effect.rs

@@ -0,0 +1,24 @@
+use crate::use_hook_did_run;
+use dioxus_core::prelude::*;
+use dioxus_signals::{CopyValue, Effect, Writable};
+
+/// Create a new effect. The effect will be run immediately and whenever any signal it reads changes.
+/// The signal will be owned by the current component and will be dropped when the component is dropped.
+///
+/// If the use_effect call was skipped due to an early return, the effect will no longer activate.
+pub fn use_effect(mut callback: impl FnMut() + 'static) {
+    let mut run_effect = use_hook(|| CopyValue::new(true));
+
+    use_hook_did_run(move |did_run| match did_run {
+        true => run_effect.set(true),
+        false => run_effect.set(false),
+    });
+
+    use_hook(|| {
+        Effect::new(move || {
+            if run_effect() {
+                callback();
+            }
+        })
+    });
+}