typings for api entities

[monkeycatdog]

Hi! I found interesting library https://github.com/mike-north/jsonapi-typescript

maybe its need to add into current lib for replace any typings ? for example

const body: ResourceObject = {
      data: {
        relationships,
        type: typeName,
        id: model.id,
        attributes: this.getDirtyAttributes(attributesMetadata, model)
      }
    };