Horizontal alignment, shared by every option object that aligns something horizontally:
a layer in its container (LayerPosition), text in a TextLayer
(TextLayerOptions), and a bitmap in a CanvasLayer (BitmapOptions).
'start'/'end' are the preferred spellings; 'left'/'right' are exact aliases kept
so existing code keeps working, and are treated identically everywhere (this library lays
out left-to-right only - 'start' never means "right" the way CSS/canvas would in RTL).
Horizontal alignment, shared by every option object that aligns something horizontally: a layer in its container (LayerPosition), text in a TextLayer (TextLayerOptions), and a bitmap in a CanvasLayer (BitmapOptions).
'start'/'end'are the preferred spellings;'left'/'right'are exact aliases kept so existing code keeps working, and are treated identically everywhere (this library lays out left-to-right only -'start'never means "right" the way CSS/canvas would in RTL).