use_if_null_to_convert_nulls_to_bools

Use an if-null operator to convert a 'null' to a 'bool'.

The analyzer produces this diagnostic when a nullable bool-valued expression is compared (using == or !=) to a boolean literal.

The following code produces this diagnostic because the nullable boolean variable b is compared to true:

void f(bool? b) {
  if (b == true) {
    // Treats `null` as `false`.
  }
}

Rewrite the condition to use ?? instead:

void f(bool? b) {
  if (b ?? false) {
    // Treats `null` as `false`.
  }
}

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.