missing_return

This function has a return type of '{0}', but doesn't end with a return statement.

Any function or method that doesn't end with either an explicit return or a throw implicitly returns null. This is rarely the desired behavior. The analyzer produces this diagnostic when it finds an implicit return.

The following code produces this diagnostic because f doesn't end with a return:

int f(int x) {
  if (x < 0) {
    return 0;
  }
}

Add a return statement that makes the return value explicit, even if null is the appropriate value.

Unless stated otherwise, the documentation on this site reflects Dart 3.7.3. Page last updated on 2025-05-08. View source or report an issue.