This is a companion issue to dart-lang/sdk#49169; this tracks making the various flutter/ github repos sound null safe. This means the code both needs to be converted to a min. SDK dep of Dart 2.12, and, not exclude any files from null safety (i.e., via a language tag in the file).

This issue is meant to track the remaining tech debt towards getting the repos sound null safe (i.e., tests which were excluded from null safety during an initial conversion, ...). Exclusions which are intentional - for example, exclusions to specifically test the behavior of pre-null-safe code - aren't meant to be tracked as part of this issue.

Repos

• flutter/samples - no exclusions
• flutter/website - no exclusions
• flutter/codelabs - no exclusions
• Address null safety exclusions in flutter/packages #110024
• Address null safety exclusions in flutter/plugins #110017
• Address null safety exclusions in flutter/gallery gallery#752
• Address null safety exclusions in flutter/devtools devtools#4399
• Address null safety exclusions in flutter/flutter #110021
• Migrate flutter CLI tool to null safety #71511
• Address null safety exclusions in flutter/engine #110020