/**
 * Spherical linear interpolation
 * NOTE: vectors are assumed to be normalized
 * @see https://en.wikipedia.org/wiki/Slerp
 * @param {Vector3|{set(x:number,y:number,z:number)}} result Rotated vector is written here
 * @param {number} a_x First vector
 * @param {number} a_y First vector
 * @param {number} a_z First vector
 * @param {number} b_x Second vector
 * @param {number} b_y Second vector
 * @param {number} b_z Second vector
 * @param {number} fraction Interpolation factor
 */
export function v3_slerp(result: any, a_x: number, a_y: number, a_z: number, b_x: number, b_y: number, b_z: number, fraction: number): void;
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