flutter_style_todos  
            
            Use Flutter TODO format: // TODO(username): message, https://URL-to-issue.
This rule is available as of Dart 2.1.0.
Details
DO use Flutter TODO format.
From the Flutter docs:
TODOs should include the string TODO in all caps, followed by the GitHub username of the person with the best context about the problem referenced by the TODO in parenthesis. A TODO is not a commitment that the person referenced will fix the problem, it is intended to be the person with enough context to explain the problem. Thus, when you create a TODO, it is almost always your username that is given.
GOOD:
// TODO(username): message.
// TODO(username): message, https://URL-to-issue.
Usage
To enable the flutter_style_todos rule,
add flutter_style_todos under linter > rules in your
analysis_options.yaml
file:
linter:
  rules:
    - flutter_style_todos