Skip to content
On this page


Sometime, structuring Flutter widget is a bit too complex, and verbose.

Because Flutter treat almost everything as a widget, mixing between an actual representation component and styling property as a widget. Things get confusing very fast.

Take a look at this:

  padding: EdgeInsets.all(20),
  child: Text(
    "Hello World",
    style: const TextStyle(
      fontSize: 21,
  • Text is the actual UI representation
  • Padding is an property which applied to the descendant

Mixing UI components with and property looks very confusing as it leads to:

  • Too much widget, knowns as "Nested Hell"
  • Unable to focused main part of the UI
  • Mixing business logic with UI Representation

Things get confusing very quick, adding more and more widgets and styling.

Property styling

However, Niku proposed the new syntax:

import 'package:niku/namespace.dart' as n;

n.Text("Hello Niku")
  ..color =
  ..fontSize = 21
  ..m = 20; // margin

As you might have guessed, Niku treat property widget as property, chaining it to read from top-to-bottom style.

Putting you in the focus on the widget that actually matter to UI Representation. Making it more predictable and straightforward.

Parent property also supports all the 3rd party widget, ensure that Niku can goes along with any codebase.

Reimplemented Widget

What make Niku differs from others chaining styling library is that, Niku rewrite important widgets and make it accepts cascade notation instead of props but still accepts the same props.

So you can style all the widget in the same convention, instead of mixing props and chaining.

// ⚠️ Different convention might be confusing
    style: TextStyle(
        fontSize: 21,
) = 20   // Padding top = 8;   // Padding x-axis

// ✅ This is also fine
    ..fontSize = 21
    ..color = = 20 = 8;

Adaptive property

Niku also features some unique handy property property you might have always wanted.

Like useThemeSelector, which adapt the property to device's theme color:

"Theme awareness".n  // String to Text shortcut
        light: (v) => v..color =,
        dark: (v) => c..color = Colors.white,

Or useTransition that auto animate transition between value:

    ..size = [100, 100]
    // Animate from simple state
        value: value,
        builder: (widget, value) => = value,

Whether you find styling with cascade notation easy, or extra property comes in handy, Niku will always try to make your code base easier, returning power to your hand again.