avoid_multiple_declarations_per_line

Don't declare multiple variables on a single line.

DON'T declare multiple variables on a single line.

BAD:

String? foo, bar, baz;

GOOD:

String? foo;
String? bar;
String? baz;

To enable the avoid_multiple_declarations_per_line rule, add avoid_multiple_declarations_per_line under linter > rules in your analysis_options.yaml file:

linter:
  rules:
    - avoid_multiple_declarations_per_line

If you're instead using the YAML map syntax to configure linter rules, add avoid_multiple_declarations_per_line: true under linter > rules:

linter:
  rules:
    avoid_multiple_declarations_per_line: true