unnecessary_non_null_assertion

The '!' will have no effect because the receiver can't be null.

The analyzer produces this diagnostic when the operand of the ! operator can't be null.

The following code produces this diagnostic because x can't be null:

int f(int x) {
  return x!;
}

Remove the null check operator (!):

int f(int x) {
  return x;
}

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.