unnecessary_const

Unnecessary 'const' keyword.

The analyzer produces this diagnostic when the keyword const is used in a constant context. The keyword isn't required because it's implied.

The following code produces this diagnostic because the keyword const in the list literal isn't needed:

const l = const <int>[];

The list is implicitly const because of the keyword const on the variable declaration.

Remove the unnecessary keyword:

const l = <int>[];

Unless stated otherwise, the documentation on this site reflects Dart 3.8.0. Page last updated on 2025-05-08. View source or report an issue.