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class extends Model {} is not a valid Sequelize model
Error: class extends Model {} is not a valid Sequelize model
    at new Serializer ([...]/node_modules/sequelize-to-json/index.js:91:13)

let serializer = new Serializer(Item, scheme);
let res = serializer.serialize(Item);

// item model

module.exports = (sequelize, DataTypes)=> {
  const Position = sequelize.define('Item', {
    name: DataTypes.STRING,
  });
  return Item;
};

Error: class extends Model {} is not a valid Sequelize model
     at new Serializer (/node_modules/sequelize-to-json/index.js:124:13)
     at Function.serializeMany (/node_modules/sequelize-to-json/index.js:352:22)

function getSegmentProfilesFor(tenant, segmentId) {
  // Object 1 of SegmentProfile
  const SegmentProfile = models(authorizerContext.tenant).SegmentProfile;
  const segmentProfiles = SegmentProfile.findAll({
    where: {
      segmentId: segmentId
    },
    order: [['createdAt', 'DESC']]
  })
  return segmentProfiles;
}

async function main() {
  const segmentProfiles = await getSegmentProfilesFor(authorizerContext.tenant, segmentId, SegmentProfile);

  // Object 2 of SegmentProfile
  const SegmentProfile = models(authorizerContext.tenant).SegmentProfile; 
  let segmentProfilesAsJSON = Serializer.serializeMany(segmentProfiles, SegmentProfile, serializeProfileScheme);
}

main()

(node:37071) UnhandledPromiseRejectionWarning: Error: Not an instance of SegmentProfile
    at Serializer.serialize (node_modules/sequelize-to-json/index.js:303:13)

function _isSpecificModelInstance(obj, model, seqVer) {
  if(seqVer >= 4) {
    return obj instanceof model;
  } else {
    return obj instanceof model.Instance;
  }
}