import { Keypoint } from '@tensorflow-models/pose-detection';
export type ProximityState = 'near' | 'far' | 'stable';
export declare class ProximityDetector {
    private baselineWidth;
    private lastState;
    private threshold;
    private callback?;
    constructor(threshold?: number);
    onChange(callback: (state: ProximityState) => void): void;
    update(keypoints: Keypoint[]): void;
}
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