| import env from '../core/env'; | 
|   | 
| type RequestAnimationFrameType = typeof window.requestAnimationFrame | 
|   | 
| let requestAnimationFrame: RequestAnimationFrameType; | 
|   | 
| requestAnimationFrame = ( | 
|     env.hasGlobalWindow | 
|         && ( | 
|             (window.requestAnimationFrame && window.requestAnimationFrame.bind(window)) | 
|             // https://github.com/ecomfe/zrender/issues/189#issuecomment-224919809 | 
|             || ((window as any).msRequestAnimationFrame && (window as any).msRequestAnimationFrame.bind(window)) | 
|             || (window as any).mozRequestAnimationFrame | 
|             // @ts-ignore | 
|             || window.webkitRequestAnimationFrame | 
|         ) | 
| ) || function (func: Parameters<RequestAnimationFrameType>[0]): number { | 
|     return setTimeout(func, 16) as any; | 
| }; | 
|   | 
| export default requestAnimationFrame; |