Demo code of extending color and font in SwiftUI

SwiftUI_colorFontExtension.swift

struct TokenColor {
    // --snip--    
    // see here for more: https://gist.github.com/vince19972/70eee7d66735739aa31567efd7a0a475
}
struct TokenTypography {
    // --snip--    
    // see here for more: https://gist.github.com/vince19972/8ff8635bdb7bfdf54b85ab711b55f634l
}

// extend from native `Color` and `Font` struct
extension Color {
    static let Token = TokenColor()
}
extension Font {
    static let Typography = TokenTypography()
}

// use the tokens
struct ContentView: View {
    Text("Demo of extension")
        .font(Font.Typography.mainFont)
        .foregroundColor(Color.Token.textTheme)  
}