function(instanceData)

Destroys an instance given the serialized form of the data. Returns any additional properties that should be added to the instance.

The following shows how constructor calls destroyData and what it does with the response:

// get its raw data
const instanceData = connection.serializeInstance( myInstance );

connection.destroyData( instanceData ).then( function( destroyedInstanceData ) {
    connection.destroyedInstance( myInstance, createdInstanceData );
} );