There's two type definitions of Color instance

[latin-1]

import Color from "colorjs.io";

const color1 = new Color("black"); // Color from "colorjs.io/types/src/index.d.ts"
const color2 = color1.to("srgb"); // Color "from colorjs.io/types/src/color.d.ts"

// @ts-expect-error Type 'Color' is missing the following properties from type 'Color': uv, xy, contrast, contrastWCAG21, and 18 more.
const color3: Color = color2;

[MysteryBlokHed]

That's because there are two different versions of the Color object:

https://github.com/LeaVerou/color.js/blob/main/src/color.js
https://github.com/LeaVerou/color.js/blob/main/src/index.js

[MysteryBlokHed]

Actually, I've looked at the code again and I can see what the problem is. I'm working on a PR that I think will fix it.