onState

Wraps the StorePlugin.onState method of the child plugin passed in the block parameter.

The child's StorePlugin.onState method will not be invoked unless you manually call StorePlugin.onState inside this block.

For pre-context parameters version, to correctly call the child method, use child.run { onState(old, new) }

The return value of block will mean what the state will be set to, i.e. the end value. Use null to not change the state. Use the return value of child.onState to delegate the result.

See the DecoratorBuilder documentation for details on how this function behaves.