avoid-throw-in-catch-block

v1.6.0

warning

recommended

free+

Warns when a throw expression is called inside a catch block

Calling throw inside a catch block loses the original stack trace and the original exception.

Since Dart 2.16 you can use Error.throwWithStackTrace to avoid loosing the original stack trace.

Example

❌ Bad:

void repository() {
  try {
    networkDataProvider();
  } on Object {
    // LINT: Avoid 'throw' inside a catch block as it causes the original stack trace and the original exception to be lost.
    //  Try using 'rethrow or 'Error.throwWithStackTrace'.
    throw RepositoryException();
  }
}

✅ Good:

void repository() {
  try {
    networkDataProvider();
  } catch (_, stack) {
    Error.throwWithStackTrace(RepositoryException(), stack);
  }
}

Related Rules

• avoid-identical-exception-handling-blocks
• avoid-only-rethrow