(nuxt sequelize-typescript) Error:Cannot read properties of undefined (reading 'prototype')

Question

Issue

when the models are added, the error Cannot read properties of undefined (reading 'prototype') happens.

Versions

• sequelize:6.19.0
• sequelize-typescript:2.1.3
• typescript:

below is the content of package.json

{
  "dependencies": {
    "nuxt": "^2.15.8",
    "pg": "^8.7.3",
    "pg-hstore": "^2.3.4",
    "reflect-metadata": "^0.1.13",
    "sequelize": "^6.19.0",
    "sequelize-typescript": "^2.1.3",
    "vue": "^2.6.14",
    "webpack": "^4.46.0"
  },
  "devDependencies": {
    "@nuxt/types": "^2.15.8",
    "@nuxt/typescript-build": "^2.1.0",
    "@types/node": "^17.0.24",
    "@types/validator": "^13.7.2",
    "sequelize-cli": "^6.4.1"
  }
}

Actual behavior

the error happens when sequelize.addModels() is executed.
I attached the error message just after the related code.

Expected behavior

the error does not happen and models can be added.

Steps to reproduce

create companyMaster.ts like the code.
import companyMaster.ts in index.ts .
execute index.ts .

I referenced the link about how to add models.

Related code

commons/sequelize/models/companyMaster.ts

import { Table, Column, Model } from 'sequelize-typescript';

@Table({
  schema: 'public',
  tableName: 'company_master',
  underscored: true,
  timestamps: true,
})
export class CompanyMaster extends Model {
  @Column
  companyNumber!: string;

  @Column
  companyName!: string;

  @Column
  homepageUrl!: string;
}

index.ts

import { Sequelize } from 'sequelize-typescript';
import { CompanyMaster } from './commons/sequelize/models/companyMaster';

const sequelize = new Sequelize(process.env.DB_CONNECTION_URI || '', {
  models: [__dirname + '/commons/sequelize/models'], // (edited) here also the error happens.
});
sequelize.addModels([CompanyMaster]); // the error happens here

the error message for the line sequelize.addModels([CompanyMaster]);

Cannot read properties of undefined (reading 'prototype')

  at node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:62:71
  at Array.map (<anonymous>)
  at Sequelize.defineModels (node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:61:23)
  at Sequelize.addModels (node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:37:36)
  at server/index.ts:30:15
  at runMicrotasks (<anonymous>)
  at processTicksAndRejections (node:internal/process/task_queues:96:5)

(edited) the error message for the line models: [__dirname + '/commons/sequelize/models'],

Cannot find module 'commons/sequelize/models/companyMaster'

Require stack:
  - node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize-service.js
  - node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js
  - node_modules/sequelize-typescript/dist/index.js
  - server/index.ts

  at Function.Module._resolveFilename (node:internal/modules/cjs/loader:933:15)
  at Function.Module._resolveFilename (node_modules/module-alias/index.js:49:29)
  at Function.Module._load (node:internal/modules/cjs/loader:778:27)
  at Module.require (node:internal/modules/cjs/loader:1005:19)
  at require (node:internal/modules/cjs/helpers:102:18)
  at node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize-service.js:45:32
  at Array.map (<anonymous>)
  at node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize-service.js:43:18
  at Array.reduce (<anonymous>)
  at getModels (node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize-service.js:35:20)
  at Sequelize.addModels (node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:36:58)
  at new Sequelize (node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:20:22)
  at server/index.ts:24:23
  at Layer.handle [as handle_request] (node_modules/express/lib/router/layer.js:95:5)
  at next (node_modules/express/lib/router/route.js:137:13)
  at Route.dispatch (node_modules/express/lib/router/route.js:112:3)

Answer 1

If you will use the "models" options, you have to export the instance (CompanyMaster) class as default.

And this line:

models: [__dirname + '/commons/sequelize/models']

Must be:

models: [__dirname + "/commons/sequelize/models/*.ts"]

Also, you don't need ".addModels()"