@visactor/vrender-core/es/common/performance-raf.js

```typescript import { xxx } from '@visactor/vrender-core'; ```

import { application } from "../application";

let idx = 0;

export class PerformanceRAF {
    constructor() {
        this.nextAnimationFrameCbs = new Map, this._rafHandle = null, this.runAnimationFrame = time => {
            this._rafHandle = null;
            const cbs = this.nextAnimationFrameCbs;
            this.nextAnimationFrameCbs = new Map, cbs.forEach((cb => cb(time)));
        }, this.tryRunAnimationFrameNextFrame = () => {
            null === this._rafHandle && 0 !== this.nextAnimationFrameCbs.size && (this._rafHandle = application.global.getRequestAnimationFrame()(this.runAnimationFrame));
        };
    }
    addAnimationFrameCb(callback) {
        return this.nextAnimationFrameCbs.set(++idx, callback), this.tryRunAnimationFrameNextFrame(), 
        idx;
    }
    removeAnimationFrameCb(index) {
        return !!this.nextAnimationFrameCbs.has(index) && (this.nextAnimationFrameCbs.delete(index), 
        !0);
    }
}
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