You are reading 12.5.1. See this page in 13.4.1.
Gradient
A simple object defining a color gradient.
Properties 8
Set to true to continue filling with the final color beyond the endPoint.
On Android, this property is only supported by radial gradients.
Default: false
Set to true to continue filling with the starting color beyond the startPoint.
On Android, this property is only supported by radial gradients.
Default: false
colors
Array<String> | Array<GradientColorRef>An array of colors, as a color name or hex triplet.
For information about color values, see the "Colors" section of Titanium.UI.
End point for the gradient.
Default: {x: 0.0, y: 1.0}
For a radial gradient, the radius at the endPoint.
Start point for the gradient.
Default: {x: 0.0, y: 0.0}
For a radial gradient, the radius at the startPoint.
type
StringType of gradient, either 'linear' or 'radial'.
Default: linear