sized_box_for_whitespace

SizedBox for whitespace.

This rule is available as of Dart 2.9.0.

Rule sets: flutter

This rule has a quick fix available.

Use SizedBox to add whitespace to a layout.

A Container is a heavier Widget than a SizedBox, and as bonus, SizedBox has a const constructor.

BAD:

Widget buildRow() {
  return Row(
    children: <Widget>[
      const MyLogo(),
      Container(width: 4),
      const Expanded(
        child: Text('...'),
      ),
    ],
  );
}

GOOD:

Widget buildRow() {
  return Row(
    children: const <Widget>[
      MyLogo(),
      SizedBox(width: 4),
      Expanded(
        child: Text('...'),
      ),
    ],
  );
}

To enable the sized_box_for_whitespace rule, add sized_box_for_whitespace under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - sized_box_for_whitespace