import { NativeTouchEvent } from 'react-native';
/**
 * Calculate squared distance between two points
 * @param a First coordinate
 * @param b Second coordinate
 */
export declare const pow2abs: (a: number, b: number) => number;
/**
 * Get distance between two touch points
 * @param touches Array of touch events
 */
export declare const getDistance: (touches: Array<NativeTouchEvent>) => number;
/**
 * Calculate scale based on distance ratio with a multiplier
 * @param currentDistance Current distance between touch points
 * @param initialDistance Initial distance between touch points
 */
export declare const getScale: (currentDistance: number, initialDistance: number) => number;
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