Dart APIunself_styleUnSymbolSizesXL XL constant Null safety double const XL Implementation static const XL = 48.0; unself_style unself_style UnSymbolSizes XL constant UnSymbolSizes class Constructors UnSymbolSizes Properties hashCode runtimeType Methods noSuchMethod toString Operators operator == Constants emojiL emojiM emojiXL Full L M None S XL XS