Dart APIunself_styleUnFontWeightextraLight extraLight constant Null safety FontWeight const extraLight FontWeight value of w200 Implementation static const FontWeight extraLight = FontWeight.w200; unself_style unself_style UnFontWeight extraLight constant UnFontWeight class Constructors UnFontWeight Properties hashCode runtimeType Methods noSuchMethod toString Operators operator == Constants black bold extraBold extraLight light medium regular semiBold thin