avoid-mounted-in-setstate

v1.30.0

warning

effort: 2m

teams+

Warns when a mounted check happens inside a setState callback.

Checking for mounted inside a setState call is too late and can lead to an exception. Always check for mounted before calling setState.

Example

❌ Bad:

void someMethod() {
  setState(() {
    // LINT: Avoid checking for 'mounted' inside the 'setState' callback.
    //  Try moving this check out.
    if (context.mounted) {
      // ...
    }
  });
}

✅ Good:

void someMethod() {
  if (context.mounted) {
    setState(() {
      // ...
    });
  }
}

Related Rules

• avoid-empty-setstate
• avoid-unnecessary-setstate
• use-setstate-synchronously