How to use the datx.modelToJSON function in datx

export function modelToJsonApi(model: IJsonapiModel): IRecord {
  const staticModel = model.constructor as typeof PureModel;
  const attributes: IDictionary = modelToJSON(model);

  const useAutogenerated: boolean = staticModel['useAutogeneratedIds'];
  const isPersisted = isModelPersisted(model);

  const data: IRecord = {
    attributes,
    id: (isPersisted || useAutogenerated) ? getModelId(model) : undefined,
    type: getModelType(model) as string,
  };

  const refs = getModelMetaKey(model, 'refs');

  Object.keys(refs).forEach((key) => {
    data.relationships = data.relationships || { };
    const refIds = getRefId(model, key);
    let rel: IDefinition|Array|undefined;