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As of the 1.19 release, Dart supports an optional mode, called strong mode , that supports stronger static typing. Strong mode helps you find bugs sooner and contributes to making Dart a sound language.   To learn more about using strong mode to enable soundness, including the how, the why, and fixes for common problems you might encounter, see:   Sound Dart  How and why to write sound Dart code, and how to use strong mode to enable soundness.  Sound Dart: FAQ  A list of common questions for those who are interested in stronger static typing.  Sound Dart: Fixing Common Problems  How to fix errors and warnings you may encounter when writing sound Dart code.