/**
 *
 * @param {number} x0 first vector X
 * @param {number} y0 first vector Y
 * @param {number} x1 second vector X
 * @param {number} y1 second vector Y
 * @returns {number} in radians
 */
export function v2_angle_between(x0: number, y0: number, x1: number, y1: number): number;
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