Sequelize: Connect multiple databases with the Different schema/model

There are two databases. Couldn't use different schema for different databases. After authenticating successfully. How to connect different schema/model? <br/>

1.

posAdminDB.users = require("../models/user/user")(sequelize, DataTypes);

2. Then
   error:

***/models/user/user.js:2
  const User = sequelize.define("user", {
                         ^
TypeError: Cannot read properties of undefined (reading 'define')

> user model

module.exports = (sequelize, DataTypes) => {
  const User = sequelize.define("user", {
    name: {
      type: DataTypes.STRING,
    },
  });
  return User;
};

<br/>

Configuration:

> DB: 1

mainDB = new Sequelize(dbConfig.DB, dbConfig.USER, dbConfig.PASSWORD, {
    dialect: dbConfig.DIALECT,
    host: dbConfig.HOST,
    port: dbConfig.PORT,
    define: {
        timestamps: false,
    },
    operatorsAliases: 0,
    pool: {
        max: dbConfig.pool.max,
        mix: dbConfig.pool.min,
        acquire: dbConfig.pool.acquire,
        idle: dbConfig.pool.idle,
    },
});

> DB: 2

posAdminDB = new Sequelize(adminDB.DB, adminDB.USER, adminDB.PASSWORD, {
    dialect: adminDB.DIALECT,
    host: adminDB.HOST,
    port: adminDB.PORT,
    define: {
        timestamps: false,
    },
    operatorsAliases: 0,
    pool: {
        max: adminDB.pool.max,
        mix: adminDB.pool.min,
        acquire: adminDB.pool.acquire,
        idle: adminDB.pool.idle,
    },
});

> Authenticate

mainDB.Sequelize = Sequelize;
mainDB.sequelize = sequelize;

posAdminDB.Sequelize = Sequelize;
posAdminDB.sequelize = sequelize;

try {
    mainDB.authenticate().then(() => {
        console.log("Connection has been established with DB:1 successfully");
    });
    posAdminDB.authenticate().then(() => {
        console.log("Connection has been established with DB:2 successfully");
    });
} catch (error) {
    console.error("Unable to connect to the database:", error);
}

> There is no error in authenticating

authenticate output: <br/>
server is running port 8080 <br/>
Executing (default): SELECT 1+1 AS result <br/>
Executing (default): SELECT 1+1 AS result <br/>
Connection has been established with DB:2 successfully <br/>
Connection has been established with DB:1 successfully <br/>

You should pass a correct Sequelize instance to a certain model registration function:

posAdminDB.users = require("../models/user/user")(posAdminDB.sequelize, DataTypes);
mainDB.users = require("../models/user/user")(mainDB.sequelize, DataTypes);