Type error about visibleEdgeColor when using outline.

I don't understand why visibleEdgeColor needs to use the number type. Using the color type should be the right one.

Using the color type can achieve the expected effect, such as red, blue, and white, but a number does not know how to fill in the color. So I think it's a small bug. But if it's not a bug, please tell me the reason for using number here.
I use TypeScript and like to wrestle with the compiler.

[v1rtl]

I'm not sure but are there constants for colors in pp?

[chasedavis]

you can can use THREE.Color("red") as shown here

Edit: Oh, I see it's a type issue even though "red" still works. Disregard :)

[faithshatto]

according to the docs, you need to pass in the hex color to avoid getting the type error: visibleEdgeColor={0xffffff} (white)