Dart APIunself_componentUnmojiwidth width property Null safety double? width final Implementation final double? width; unself_component unself_component Unmoji width property Unmoji class Constructors Unmoji Properties emoji fit hashCode height key runtimeType twemojiFormat unicode width Methods build createElement debugDescribeChildren debugFillProperties noSuchMethod toDiagnosticsNode toString toStringDeep toStringShallow toStringShort Operators operator ==