SassColor.oklch constructor
Creates a color in ColorSpace.oklch.
If null is passed for alpha, that indicates that it's a missing
component. In most cases, this is equivalent to the color being
transparent.
Throws a RangeError if alpha isn't between 0 and 1.
Implementation
factory SassColor.oklch(double? lightness, double? chroma, double? hue,
[double? alpha = 1]) =>
SassColor.forSpaceInternal(
ColorSpace.oklch, lightness, chroma, hue, alpha);