sequelize add column to existing table without migration code example

Example 1: sequelize migration add column foreign key

queryInterface.addConstraint('table_name', {
  fields: ['column_name'],
  type: 'foreign key',
  name: 'custom_fkey_constraint_name', // optional
  references: {
    table: 'target_table_name',
    field: 'target_column_name'
  },
  onDelete: 'cascade',
  onUpdate: 'cascade'
});

Example 2: sequelize add column existing model

Add altering commands here.
Return a promise to correctly handle asynchronicity.

Example:
return queryInterface.createTable('users', { id: Sequelize.INTEGER });