Dart APIunself_styleUnSymbolSizesM M constant Null safety double const M Implementation static const M = 24.0; unself_style unself_style UnSymbolSizes M constant UnSymbolSizes class Constructors UnSymbolSizes Properties hashCode runtimeType Methods noSuchMethod toString Operators operator == Constants emojiL emojiM emojiXL Full L M None S XL XS