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

import {
  Color
} from '../../../src/Three';

export class Lut {
  constructor(colormap?: string, numberofcolors?: number);
  lut: Color[];
  map: object[];
  n: number;
  minV: number;
  maxV: number;

  set(value: Lut): this;
  setMin(min: number): this;
  setMax(max: number): this;
  setColorMap(colormap?: string, numberofcolors?: number): this;
  copy(lut: Lut): this;
  getColor(alpha: number): Color;
  addColorMap(colormapName: string, arrayOfColors: number[][]): void;
  createCanvas(): HTMLCanvasElement;
  updateCanvas(canvas: HTMLCanvasElement): HTMLCanvasElement;
}

export interface ColorMapKeywords {
  rainbow: number[][];
  cooltowarm: number[][];
  blackbody: number[][];
  grayscale: number[][];
}