Ever needed to return an empty box (that takes no space) in Flutter?
There's a widget for that → SizedBox.shrink()
This is more performant than returning an empty Container (which is complex inside and can't be declared as a const widget).
Note that in many cases, you can avoid returning a widget in the first place.
For example, if you are inside a Row or Column, you can just use the collection-if operator instead. 👇
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