npx sequelize-cli breaking on node 26

Start by reproducing the failure with a .sequelizerc file using require and npx sequelize-cli db:create or --version under Node.js 26. Compare the behavior with Node.js 24 or 25, then trace how sequelize-cli loads the .sequelizerc; done means the documented CommonJS configuration works for projects with "type": "module" without the shown error.

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Bug Description

When using sequelize-cli in a project having "type": "module" with a .js config file path (via .sequelizerc), commands(even npx sequeliize-cli --version) break with follwing error trace

ReferenceError: require is not defined in ES module scope, you can use import instead
    at file:///Users/rpsingh/dev/sif_ms/.sequelizerc:1:14
    at ModuleJobSync.runSync (node:internal/modules/esm/module_job:673:37)

Reproducible Example

1. Create a .sequelizerc file:

const path = require('path');

module.exports = {
  'config': path.resolve('config', 'database.js'),
  'models-path': path.resolve('app', 'models'),
  'seeders-path': path.resolve('db', 'seeders'),
  'migrations-path': path.resolve('db', 'migrations')
}

2. Run:

npx sequelize-cli db:create

What do you expect to happen?

db should be created.

What is actually happening?

Following erorr is occuring

npx sequelize-cli --version
file:///Users/rpsingh/dev/sif_ms/.sequelizerc:1
const path = require('path');
             ^

ReferenceError: require is not defined in ES module scope, you can use import instead
    at file:///Users/rpsingh/dev/sif_ms/.sequelizerc:1:14
    at ModuleJobSync.runSync (node:internal/modules/esm/module_job:673:37)
    at ModuleLoader.importSyncForRequire (node:internal/modules/esm/loader:350:47)
    at loadESMFromCJS (node:internal/modules/cjs/loader:1752:24)
    at Module._compile (node:internal/modules/cjs/loader:1916:5)
    at Object..js (node:internal/modules/cjs/loader:2074:10)
    at Module.load (node:internal/modules/cjs/loader:1656:32)
    at Module._load (node:internal/modules/cjs/loader:1448:12)
    at wrapModuleLoad (node:internal/modules/cjs/loader:261:19)
    at Module.require (node:internal/modules/cjs/loader:1679:12)

Node.js v26.5.0

Environment

• Sequelize-cli version: 6.6.5
• Node.js version: 26.5.0
• If TypeScript related: N/A
• Database & Version: N/A
• Connector library & Version: N/A

More info

This bug is not occuring in node version 24 or 25.