prefer-constrained-box-over-container

v1.31.0

style

effort: 2m

has auto-fix

teams+

Suggests using the ConstrainedBox widget instead of the Container widget with only the constraints argument.

Example

❌ Bad:

class SomeWidget {
  Widget build() {
    // LINT: Prefer 'ConstrainedBox' over 'Container' with only the 'constraints' argument.
    Container(constraints: BoxConstraints(), child: Widget());
  }
}

✅ Good:

class SomeWidget {
  Widget build() {
    ConstrainedBox(constraints: BoxConstraints(), child: Widget());
    Container(
      margin: EdgeInsetsGeometry.left,
      constraints: BoxConstraints(),
      child: Widget(),
    );
  }
}

Related Rules

• prefer-align-over-container
• prefer-transform-over-container
• prefer-container