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    The @Attribute decorator is used to add an attribute to a model. It is used on an instance property.

    The simplest way to use it is to pass a data type as the parameter:

    class User extends Model<InferAttributes<User>, InferCreationAttributes<User>> {
    @Attribute(DataTypes.STRING)
    declare firstName: string | null;
    }

    @Attribute also accepts an option bag, index~AttributeOptions, which allows you to configure all available attribute definition options.

    class User extends Model<InferAttributes<User>, InferCreationAttributes<User>> {
    @Attribute({
    type: DataTypes.STRING,
    allowNull: false,
    })
    declare firstName: string;
    }