Compiler error for SwiftUI previews

[KyNorthstar]

/Path/To/Swift-Rectangle-Tools/Sources/RectangleTools/Default Conformances/EdgeInsets + FourSided.swift:97:19: error: no type named 'EdgeInsets' in module 'SwiftUI'
extension SwiftUI.EdgeInsets: FourSidedAbsolute {
                  ^
/Path/To/Swift-Rectangle-Tools/Sources/RectangleTools/Default Conformances/EdgeInsets + FourSided.swift:124:26: error: no type named 'EdgeInsets' in module 'SwiftUI'
public extension SwiftUI.EdgeInsets {
                         ^