Using Sequelize CLI with the ESM package

I had the same issue and the way I got around it is by calling sequelize-cli from the node_modules folder.

In my package.json

{
    "scripts": {
        "migrate": "node --require esm ./node_modules/.bin/sequelize-cli db:migrate"
    }
}

then if you run npm run migrate it should work with es6 imports.