Dart APIunself_styleUnFontWeightblack black constant Null safety FontWeight const black FontWeight value of w900 Implementation static const FontWeight black = FontWeight.w900; unself_style unself_style UnFontWeight black constant UnFontWeight class Constructors UnFontWeight Properties hashCode runtimeType Methods noSuchMethod toString Operators operator == Constants black bold extraBold extraLight light medium regular semiBold thin