refactor(server): canonicalize service API (#31049)

packages/tui/src/util/signal.ts

@@ -0,0 +1,41 @@
+import { createEffect, createSignal, on, onCleanup, type Accessor } from "solid-js"
+import { debounce, type Scheduled } from "@solid-primitives/scheduled"
+
+export function createDebouncedSignal<T>(value: T, ms: number): [Accessor<T>, Scheduled<[value: T]>] {
+  const [get, set] = createSignal(value)
+  return [get, debounce((v: T) => set(() => v), ms)]
+}
+
+export function createFadeIn(show: Accessor<boolean>, enabled: Accessor<boolean>) {
+  const [alpha, setAlpha] = createSignal(show() ? 1 : 0)
+  let revealed = show()
+
+  createEffect(
+    on([show, enabled], ([visible, animate]) => {
+      if (!visible) {
+        setAlpha(0)
+        return
+      }
+
+      if (!animate || revealed) {
+        revealed = true
+        setAlpha(1)
+        return
+      }
+
+      const start = performance.now()
+      revealed = true
+      setAlpha(0)
+
+      const timer = setInterval(() => {
+        const progress = Math.min((performance.now() - start) / 160, 1)
+        setAlpha(progress * progress * (3 - 2 * progress))
+        if (progress >= 1) clearInterval(timer)
+      }, 16)
+
+      onCleanup(() => clearInterval(timer))
+    }),
+  )
+
+  return alpha
+}