three.js/examples/jsm/math/SimplexNoise.d.ts

export class SimplexNoise {
  constructor(r?: object);
  dot(g: number[], x: number, y: number): number;
  dot3(g: number[], x: number, y: number, z: number): number;
  dot4(g: number[], x: number, y: number, z: number, w: number): number;
  noise(xin: number, yin: number): number;
  noise3d(xin: number, yin: number, zin: number): number;
  noise4d(x: number, y: number, z: number, w: number): number;
}