There are a number of linter warnings. These should be resolved.
'hashValues' is deprecated and shouldn't be used. Use Object.hash() instead. This feature was deprecated in v3.1.0-0.0.pre.897.
Try replacing the use of the deprecated member with the replacement.
Avoid leading underscores for local identifiers.
Sort child properties last in widget instance creations.
Avoid leading underscores for local identifiers.
A value for optional parameter 'child' isn't ever given.
'fixTextFieldOutlineLabel' is deprecated and shouldn't be used. This "fix" is now enabled by default. This feature was deprecated after v2.5.0-1.0.pre..
'primaryColorBrightness' is deprecated and shouldn't be used. No longer used by the framework, please remove any reference to it. This feature was deprecated after v2.6.0-11.0.pre..
'vsync' is deprecated and shouldn't be used. This field is now ignored. This feature was deprecated after v2.2.0-10.1.pre..
'fadeDuration' is deprecated and shouldn't be used. Use SelectionOverlay.fadeDuration instead. This feature was deprecated after v2.12.0-4.1.pre..
There are a number of linter warnings. These should be resolved.
SelectionOverlay.fadeDuration
instead. This feature was deprecated after v2.12.0-4.1.pre..