isFutureVoid abstract method

Determines whether this method declares a Future<void> return type.

This method inspects the declared return type of the method and returns true if it represents an asynchronous computation that completes with no value (i.e., a Future<void>).

It is particularly useful in reflection, proxy generation, or method interceptors where you need to distinguish between:

• Asynchronous void methods (Future<void>) that perform side effects,
• Asynchronous value-returning methods (Future<T>), and
• Synchronous void methods (void).

Example

class Example {
  Future<void> save() async {}
  Future<int> compute() async => 42;
  void reset() {}
}

final saveMethod = Class(Example).getMethod('save');
final computeMethod = Class(Example).getMethod('compute');
final resetMethod = Class(Example).getMethod('reset');

print(saveMethod.isFutureVoid());   // true
print(computeMethod.isFutureVoid()); // false
print(resetMethod.isFutureVoid());   // false

@return true if the method’s return type is Future<void>, false otherwise.