Sequelize migration add/drop multiple columns (transacting)

20181118235404-some-migration.js

module.exports = {
    up: (queryInterface, Sequelize) => {
        return queryInterface.sequelize.transaction((t) => {
            return Promise.all([
                queryInterface.addColumn('table_name', 'column_name1', {
                    type: Sequelize.STRING
                }, { transaction: t }),
                queryInterface.addColumn('table_name', 'column_name2', {
                    type: Sequelize.STRING,
                }, { transaction: t })
            ])
        })
    },

    down: (queryInterface, Sequelize) => {
        return queryInterface.sequelize.transaction((t) => {
            return Promise.all([
                queryInterface.removeColumn('table_name', 'column_name1', { transaction: t }),
                queryInterface.removeColumn('table_name', 'column_name2', { transaction: t })
            ])
        })
    }
};