@phaserjs/phaser/math/Bezier.js

Phaser 4

export function Bezier(a, b, c, d, t) {
  const inverseFactor = 1 - t;
  const inverseFactorTimesTwo = inverseFactor * inverseFactor;
  const factorTimes2 = t * t;
  const factor1 = inverseFactorTimesTwo * inverseFactor;
  const factor2 = 3 * t * inverseFactorTimesTwo;
  const factor3 = 3 * factorTimes2 * inverseFactor;
  const factor4 = factorTimes2 * t;
  return a * factor1 + b * factor2 + c * factor3 + d * factor4;
}