How to decorate text stroke in Flutter?

Stroke has been possible without workarounds since the addition of foreground paints in TextStyle. An explicit example of stroke under fill bordered text has been added in the TextStyle documentation: https://master-api.flutter.dev/flutter/painting/TextStyle-class.html#painting.TextStyle.6

This example is reproduced here:

Stack(
  children: <Widget>[
    // Stroked text as border.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        foreground: Paint()
          ..style = PaintingStyle.stroke
          ..strokeWidth = 6
          ..color = Colors.blue[700],
      ),
    ),
    // Solid text as fill.
    Text(
      'Greetings, planet!',
      style: TextStyle(
        fontSize: 40,
        color: Colors.grey[300],
      ),
    ),
  ],
)

Stroke by itself is possible by removing the Stack and just using the first stroke Text widget by itself. The stroke/fill order can also be adjusted by swapping the first and second Text widget.