HSL(A) Type in elm

HSLA.elm

{-| The internal type is an opaque type but we expose helper functions for each colors and mapping functions for each value.
-}
type Hsla
    = Hsla Hue Saturation Lightness Alpha

{-| Each defined color is exposed as another custom type, to enable easy pattern matching.
It's useful in configurations for example.
-}
type Color
    = White
    | Base
    | Dark
    | Darker
    | Darkest
    | Black
    | Primary
    | Link
    | Buy
    ...
    
-- Helper functions for each defined color is exposed. Use them when there is no need to pattern match on the color

{-| #009e2f Green
-}
primary : Hsla
primary =
    Hsla 138 1 0.31 1