What goes in the Sequelize "config file"?

I'm just starting out with Sequelize in Node.js and finding the documentation really lacking. I have a 'db' module in which I connect to the database via Sequelize, and this reads in configuration from an application-wide config file at ./config.json relative to the root of my project. This is a nested configuration and extremely unlikely to be structured in the way that Sequelize wants a config file for the CLI.

Now I'm trying to use migrations and the documentation makes reference to a "config file". I know I can set the path to that config file, but what the heck do I put in it? It's not documented anywhere (that I've seen).

There are more stuff you could put into config file

var sequelize = new Sequelize(config.database.dbName, config.database.master.user,     config.database.master.password, {
    dialect: config.database.protocol,
    port: config.database.port,
    host: config.database.master.host,
    /* You could setup replication as well
    replication: {
     read: [
     {
       host: config.database.master.host,
       username: config.database.master.host,
       password: config.database.master.password
     },
     {
       host: config.database.master.host,
       username: config.database.master.host,
       password: config.database.master.password
     }
     ],
     write: {
       host: config.database.master.host,
       username: config.database.master.host,
       password: config.database.master.password
     }
     */
    },
    pool: {
        maxConnections: config.database.pool.maxConnections,
        maxIdleTime: config.database.pool.maxIdleTime
    },

    logging: false,
    define: {
        underscored: false,
        freezeTableName: false,
        syncOnAssociation: true,
        charset: 'utf8',
        collate: 'utf8_general_ci',
        classMethods: {method1: function() {}},
        instanceMethods: {method2: function() {}},
        timestamps: true
        schema: "prefix"
    }
}),

I read the code to figure it out. It's a flat structure. I just rebuild the config in a different format from my own config.

var config = require('./config');

module.exports = {
  database: config.database.name,
  username: config.database.user,
  password: config.database.pass,
  dialect: 'postgres',
  dialectModulePath: 'pg.js',
  host: config.database.host,
  port: config.database.port,
  pool: config.database.pool
};