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avoid-throw-in-catch-block

added in: 1.6.0
warning
Free+
preset: recommended

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 {
    throw RepositoryException(); // 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'.
  }
}

✅ Good:

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