postgress - why does CREATE DOMAIN not working?

Question

The setting: Node / express / pg

While the following works fine

CREATE TABLE blah(foo VARCHAR(128) PRIMARY KEY);

The following breaks

CREATE DOMAIN Foo VARCHAR(128);  
CREATE TABLE blah(foo FOO PRIMARY KEY);

With the following error

error: input of anonymous composite types is not implemented  at Parser.parseErrorMessage (.../node_modules/pg-protocol/src/parser.ts:369:69)

The node code that triggers this is (roughly):

const { Pool } = require('pg');
const pool = new Pool();

module.exports = {
  query: (text, params) => pool.query(text, params),
}

called:

await db.query('CREATE DOMAIN Foo VARCHAR(128);');
await db.query('CREATE TABLE blah(foo FOO PRIMARY KEY);');

The second call crashes