onlyLeft method
Redondea solo las esquinas del lado izquierdo (topLeft + bottomLeft)
Ejemplo:
AppRadiusPartial._().onlyLeft(16.0)
// BorderRadius.only(topLeft: Radius.circular(16.0), bottomLeft: Radius.circular(16.0))
Implementation
BorderRadius onlyLeft(double radius) => BorderRadius.only(
topLeft: Radius.circular(radius),
bottomLeft: Radius.circular(radius),
);