Text Span 
A representation of Typography.
NikuTextSpan accepts all the props as same as RichText.
dart
// Using namespace
n.TextSpan("");
// Using Niku Prefix
NikuTextSpan("");Example Usage 
dart
n.TextSpan("Rich Text: ")
    ..color = Colors.black
    ..children = [
        n.TextSpan("with "),
        n.TextSpan("underline")..underline,
        n.TextSpan(" and "),
        n.TextSpan("italic")..italic,
    ];Using extension 
dart
"Rich Text: ".n.span
    ..color = Colors.black;