avoid_types_on_closure_parameters

Avoid annotating types for function expression parameters.

AVOID annotating types for function expression parameters.

Annotating types for function expression parameters is usually unnecessary because the parameter types can almost always be inferred from the context, thus making the practice redundant.

BAD:

var names = people.map((Person person) => person.name);

GOOD:

var names = people.map((person) => person.name);

The avoid_types_on_closure_parameters rule is incompatible with the following rules:

• always_specify_types

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

linter:
  rules:
    - avoid_types_on_closure_parameters

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

linter:
  rules:
    avoid_types_on_closure_parameters: true

Unless stated otherwise, the documentation on this site reflects Dart 3.6.0. Page last updated on 2025-01-27. View source or report an issue.