Dart APIunself_styleUnSymbolSizesNone None constant Null safety double const None Implementation static const None = 12.0; unself_style unself_style UnSymbolSizes None constant UnSymbolSizes class Constructors UnSymbolSizes Properties hashCode runtimeType Methods noSuchMethod toString Operators operator == Constants emojiL emojiM emojiXL Full L M None S XL XS