AspectRatio is a property introduced by Yoga and is not present as a settable property in the css flexbox specification. Flexbox does has the notion of aspect ratio though for things with intrinsic aspect ratio such as images.
aspect ratio property in Yoga has the following properties:
heightof a node e.g. if a node has an aspect ratio of 2 then its
widthis twice the size of its
maxdimensions of an item.
heightare set then the cross axis dimension is overridden.