[improvement] optimize utils (#3104)

packages/utils/event.ts

@@ -1,7 +1,7 @@
 /* eslint-disable no-empty */
 /* eslint-disable getter-return */
 /* eslint-disable import/no-mutable-exports */
-import { noop, isServer } from '.';
+import { isServer } from '.';
 
 type EventHanlder = (event?: Event) => void;
 
@@ -16,18 +16,29 @@ if (!isServer) {
         supportsPassive = true;
       }
     });
-    window.addEventListener('test-passive', noop, opts);
+    window.addEventListener('test-passive', null as any, opts);
   } catch (e) {}
 }
 
-export function on(target: HTMLElement, event: string, handler: EventHanlder, passive = false) {
+export function on(
+  target: HTMLElement,
+  event: string,
+  handler: EventHanlder,
+  passive = false
+) {
   if (!isServer) {
-    target.addEventListener(event, handler, supportsPassive ? { capture: false, passive } : false);
+    target.addEventListener(
+      event,
+      handler,
+      supportsPassive ? { capture: false, passive } : false
+    );
   }
 }
 
 export function off(target: HTMLElement, event: string, handler: EventHanlder) {
-  !isServer && target.removeEventListener(event, handler);
+  if (!isServer) {
+    target.removeEventListener(event, handler);
+  }
 }
 
 export function stop(event: Event) {

packages/utils/raf.ts

@@ -19,10 +19,10 @@ function fallback(fn: FrameRequestCallback): number {
 const root = <Window>(isServer ? global : window);
 
 /* istanbul ignore next */
-const iRaf = root.requestAnimationFrame || root.webkitRequestAnimationFrame || fallback;
+const iRaf = root.requestAnimationFrame || fallback;
 
 /* istanbul ignore next */
-const iCancel = root.cancelAnimationFrame || root.webkitCancelAnimationFrame || root.clearTimeout;
+const iCancel = root.cancelAnimationFrame || root.clearTimeout;
 
 export function raf(fn: FrameRequestCallback): number {
   return iRaf.call(root, fn);

packages/utils/use/sfc.ts

@@ -85,10 +85,8 @@ function defaultProps(props: any) {
 
 function install(this: ComponentOptions<Vue>, Vue: VueConstructor) {
   const { name } = this;
-  if (name) {
-    Vue.component(name, this);
+  Vue.component(name as string, this);
   Vue.component(camelize(`-${name}`), this);
-  }
 }
 
 // unify slots & scopedSlots