prefer_typing_uninitialized_variables

Prefer typing uninitialized variables and fields.

This rule is available as of Dart 2.0.0.

Rule sets: core, recommended, flutter

This rule has a quick fix available.

Details

PREFER specifying a type annotation for uninitialized variables and fields.

Forgoing type annotations for uninitialized variables is a bad practice because you may accidentally assign them to a type that you didn’t originally intend to.

BAD:

class BadClass {
  static var bar; // LINT
  var foo; // LINT

  void method() {
    var bar; // LINT
    bar = 5;
    print(bar);
  }
}

BAD:

void aFunction() {
  var bar; // LINT
  bar = 5;
  ...
}

GOOD:

class GoodClass {
  static var bar = 7;
  var foo = 42;
  int baz; // OK

  void method() {
    int baz;
    var bar = 5;
    ...
  }
}

Usage

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

linter:
  rules:
    - prefer_typing_uninitialized_variables