how to use 'extended color' in flutter ?

[lien-dkseo]

// theme.dart
  ...
  ...

  /// Divider
  static const divider = ExtendedColor(
    seed: Color(0xffd6d6d6),
    value: Color(0xffd6d6d6),
    light: ColorFamily(
      color: Color(0xff006874),
      onColor: Color(0xffffffff),
      colorContainer: Color(0xff9eeffd),
      onColorContainer: Color(0xff001f24),
    ),
    lightMediumContrast: ColorFamily(
      color: Color(0xff006874),
      onColor: Color(0xffffffff),
      colorContainer: Color(0xff9eeffd),
      onColorContainer: Color(0xff001f24),
    ),
    lightHighContrast: ColorFamily(
      color: Color(0xff006874),
      onColor: Color(0xffffffff),
      colorContainer: Color(0xff9eeffd),
      onColorContainer: Color(0xff001f24),
    ),
    dark: ColorFamily(
      color: Color(0xff82d3e0),
      onColor: Color(0xff00363d),
      colorContainer: Color(0xff004f58),
      onColorContainer: Color(0xff9eeffd),
    ),
    darkMediumContrast: ColorFamily(
      color: Color(0xff82d3e0),
      onColor: Color(0xff00363d),
      colorContainer: Color(0xff004f58),
      onColorContainer: Color(0xff9eeffd),
    ),
    darkHighContrast: ColorFamily(
      color: Color(0xff82d3e0),
      onColor: Color(0xff00363d),
      colorContainer: Color(0xff004f58),
      onColorContainer: Color(0xff9eeffd),
    ),
  );

  List<ExtendedColor> get extendedColors => [
        divider,
      ];

how to use 'static const divider' or 'get extendedColors' in flutter ?