Grammar not working postgres

migration.php

<?php
// ...
    public function up()
    {
        Grammar::macro('typeFoo', function () {
            return 'foo';
        });
 
        DB::unprepared('CREATE TYPE foo AS ENUM ('a', 'b', 'c');');
 
        Schema::create('my_table', function (Blueprint $table) {
            $table->bigIncrements('id');
            $table->addColumn('foo', 'my_foo_col');
        });
    }
// ...