chore: move useCountdown to @vant/use

src/utils/dom/raf.ts

@@ -1,36 +0,0 @@
-/**
- * requestAnimationFrame polyfill
- */
-
-import { inBrowser } from '../base';
-
-let prev = Date.now();
-
-function fallback(fn: FrameRequestCallback): number {
-  const curr = Date.now();
-  const ms = Math.max(0, 16 - (curr - prev));
-  const id = setTimeout(fn, ms);
-  prev = curr + ms;
-  return id;
-}
-
-const root = (inBrowser ? window : global) as Window;
-
-const iRaf = root.requestAnimationFrame || fallback;
-
-const iCancel = root.cancelAnimationFrame || root.clearTimeout;
-
-export function raf(fn: FrameRequestCallback): number {
-  return iRaf.call(root, fn);
-}
-
-// double raf for animation
-export function doubleRaf(fn: FrameRequestCallback): void {
-  raf(() => {
-    raf(fn);
-  });
-}
-
-export function cancelRaf(id: number) {
-  iCancel.call(root, id);
-}

src/utils/index.ts

@@ -3,7 +3,6 @@ export * from './create';
 export * from './format/unit';
 export * from './format/number';
 export * from './format/string';
-export * from './dom/raf';
 export * from './dom/style';
 export * from './dom/event';
 export * from './dom/scroll';