public boolean isUseSingleton() {
    return immutableFeatures.singleton()
        || useAttributelessSingleton()
        || useSingletonNoOtherWay();
  }
Check if mongo repository should be generated (for annotation {@code @Mongo.Repository}).
For criteria repository see {@link #isGenerateCriteriaRepository()}
value-processor/src/org/immutables/value/processor/meta/ValueType.java