This adds a default hook to all models, which is run if the model does not define its own hook:

class User extends Model {}
User.init({}, { sequelize });
class Project extends Model {}
Project.init({}, {
    hooks: {
        beforeCreate: () => {
            // Do other stuff
        }
    sequelize
User.create() // Runs the global hook
Project.create() // Runs its own hook (because the global hook is overwritten)

class User extends Model {}
User.init({}, { sequelize });
class Project extends Model {}
Project.init({}, {
    hooks: {
        beforeCreate: () => {
    },
    sequelize
});
User.create() // Runs the global hook
Project.create() // Runs its own hook, followed by the global hook

Permanent hooks may also be defined in Sequelize.options:

beforeConnect(config)
afterConnect(connection, config)
beforeDisconnect(connection)

These hooks can be useful if you need to asynchronously obtain database credentials, or need to directly access the low-level database connection after it has been created.

These hooks may only be declared as a permanent global hook, as the connection pool is shared by all models.