Avoid private typedef functions.

AVOID private typedef functions used only once. Prefer inline function syntax.

BAD:

typedef void _F();
m(_F f);

GOOD:

m(void Function() f);

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

linter:
  rules:
    - avoid_private_typedef_functions

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

linter:
  rules:
    avoid_private_typedef_functions: true