Encountering issues when trying to combine Sequelize with TypeScript

As I attempted to transition my NodeJs application to TypeScript, I encountered issues with Sequelize.

Upon attempting to implement the code from a website, an error occurred:

This expression is not constructable.
  Type 'typeof import("/home/developer/devel/metricsutilities/WorklogMetrics/node_modules/sequelize/types/index")' has no construct signatures.ts(2351)

The code in question serves as a straightforward database connector

import * as Sequelize from 'sequelize'

export const sequelize = new Sequelize("xx", "xxx", "xxx", {
  host: "xxx",
  dialect: "postgres",
  pool: {
    max: 15,
    min: 0,
    idle: 10000,
  },
  logging: false,
  timezone: "+01:00",
});
sequelize.authenticate()

This setup works fine within a regular JavaScript NodeJS application running Sequelize version 6.21.3. However, it fails to function properly within my updated NodeJS application due to the differences between versions listed below: Node 16.10.0 on Linux Ubuntu Sequelize 6.28.0 @types/sequelize: 4.28.14

Could there be something missing within the constructor that is causing this discrepancy?

javascriptnode.jstypescriptsequelize.js

Answer №1

To properly import the module, make sure to separate classes/functions/enums/interfaces by enumerating them inside curly braces {} in the import statement like this:

import { Sequelize, Op } from 'sequelize'

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