[type] raf (#2699)

packages/utils/index.ts

@@ -0,0 +1,41 @@
+import Vue from 'vue';
+
+export { use } from './use';
+
+export const isServer: boolean = Vue.prototype.$isServer;
+
+export function noop() {}
+
+export function isDef(value: any): boolean {
+  return value !== undefined && value !== null;
+}
+
+export function isObj(x: any): boolean {
+  const type = typeof x;
+  return x !== null && (type === 'object' || type === 'function');
+}
+
+export function get(object: any, path: string): any {
+  const keys = path.split('.');
+  let result = object;
+
+  keys.forEach(key => {
+    result = isDef(result[key]) ? result[key] : '';
+  });
+
+  return result;
+}
+
+const camelizeRE = /-(\w)/g;
+export function camelize(str: string): string {
+  return str.replace(camelizeRE, (_, c) => c.toUpperCase());
+}
+
+export function isAndroid(): boolean {
+  /* istanbul ignore next */
+  return isServer ? false : /android/.test(navigator.userAgent.toLowerCase());
+}
+
+export function range(num: number, min: number, max: number): number {
+  return Math.min(Math.max(num, min), max);
+}