extname  | extowner | extnamespace | extrelocatable | extversion | extconfig | extcondition
-----------+----------+--------------+----------------+------------+-----------+--------------
 plpgsql   |       10 |           11 | f              | 1.0        |           |
 uuid-ossp |    16384 |         2200 | t              | 1.1        |           |
(2 rows)

pgm.createExtension('uuid-ossp', { ifNotExists: true });
// and
pgm.createTable('my_table', {
    id: { type: 'uuid', primaryKey: true, default: new PgLiteral('gen_random_uuid()') },
    // ...