sort_pub_dependencies  
            
            Sort pub dependencies alphabetically.
This rule is available as of Dart 2.1.0.
Details
DO sort pub dependencies alphabetically (A to Z) in pubspec.yaml.
Sorting list of pub dependencies makes maintenance easier.
Usage
To enable the sort_pub_dependencies rule,
add sort_pub_dependencies under linter > rules in your
analysis_options.yaml
file:
linter:
  rules:
    - sort_pub_dependencies