/**
 * Ken Perlin's suggested improvement on `smoothStep` function
 * has gentler entry and exit slope
 * @see https://en.wikipedia.org/wiki/Smoothstep
 * @param {number} edge0
 * @param {number} edge1
 * @param {number} x
 * @returns {number}
 */
export function smootherStep(edge0: number, edge1: number, x: number): number;
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