Dart : How to ignore omit_local_variable_types warning?

Question

I'm developing a mobile app plus web frontend with Dart / Flutter with IntelliJ Idea. The current version of Dart warns about correctly typing local variables. There is a Dart style guide https://dart-lang.github.io/linter/lints/omit_local_variable_types.html saying "Usually, the types of local variables can be easily inferred, so it isn't necessary to annotate them."

This might be true for a compiler but it sure is not true for human readers. Since it especially defers type problems to the usage part of a variable, bug detection and code reading is becoming more expensive.

So how can I disable this warning on compiler / project level?

Even better: how can I force a warning if the type is not set?

Answer 1

I know this is a bit old, but I see there isn’t an answer, so adding here now for future use.

In the root of your project folder, add an “analysis_options.yaml” file, and include the below code. Read further at: https://dart.dev/guides/language/analysis-options

analysis _options.yaml:

linter:
    rules:
        always_specify_types: true
        omit_local_variable_types: false

Unsure if both are required when always specifying types, but give it a go.

Answer 2

To ignore the warnings only for a specific file:

// ignore_for_file: omit_local_variable_types

class Foo {
  // ...
}

Answer 3

Add // ignore: omit_local_variable_types above warning code line:

  // ignore: omit_local_variable_types
  int years = (dif.inDays / 365).floor();