OKLAB color space

interface OkLabColor {
  l: number;
  a: number;
  b: number;
  alpha?: number | undefined;
}

function rgbToOkLab(color: Color): OkLabColor

import { rgbToOkLab, fromRgb } from '@temelj/color';

const oklab = rgbToOkLab(fromRgb(255, 0, 0));
// { l: 0.628, a: 0.225, b: 0.126, alpha: undefined }

const oklabWithAlpha = rgbToOkLab(fromRgb(0, 128, 255, 0.8));
// { l: 0.559, a: -0.162, b: -0.112, alpha: 0.8 }

function okLabToRgb(color: OkLabColor): Color

import { okLabToRgb } from '@temelj/color';

const rgb = okLabToRgb({ l: 0.5, a: 0.1, b: -0.1 });
// { red: 156, green: 94, blue: 163, alpha: undefined }

const rgbWithAlpha = okLabToRgb({ l: 0.7, a: 0, b: 0, alpha: 0.5 });
// { red: 170, green: 170, blue: 170, alpha: 0.5 }