[WolfieLeader]

Fixes #1164.

With fetch_types: false, built-in arrays are neither parsed nor serialized:

const sql = postgres({ fetch_types: false })
await sql`select array['x','y']::text[] as t, array[1,2]::int4[] as i`
// [{ t: '{x,y}', i: '{1,2}' }]  (strings)
await sql`select ${ sql.array(['a', 'b']) }::text[]`
// PostgresError 22P02: malformed array literal: "a,b"

Only fetchArrayTypes() registers array parsers and serializers, and it runs only when fetch_types is true. Cloudflare's Hyperdrive guide for Postgres.js turns fetch_types off to save a round trip.

This change registers 22 built-in element/array pairs when fetch_types is false. Built-in types can be hard-coded because PostgreSQL fixes their OIDs in its catalog (pg_type.dat), so they are the same in every install. Custom types still need fetch_types. fetch_types: true is unchanged.

Changes

• addArrayType() moves from connection.js to types.js and takes options first.
• parseOptions() registers the pairs. addArrayType() keeps a parser or serializer that is already set (feat: don't override array type if already exists #578), so user types still win.
• It runs in parseOptions(), not per connection. Per connection, the eager subscribe client filled the parent's serializers first and broke Insert array with undefined transform.
• With fetch_types: false, built-in array columns now come back as JS arrays instead of '{x,y}' strings. Code that parsed those strings itself will see a change.

Test

New Built-in array types without fetch_types in tests/index.js. Before: 22P02 malformed array literal: "c,d". After: passes.

node tests/index.js and npm run test:cjs pass in full on Node 24.21.0 and PostgreSQL 15, set up like CI. Deno not run. eslint is clean. The 22 pairs match pg_type on PostgreSQL 12, 15 and 18.

Questions

• Cover every built-in array type (inet[], timetz[], point[]), not only the 22 most common?
• Also register them when fetch_types is true, so the first query does not depend on the type fetch (Wrong inferred array types when invoking sql.array() for the first time. #789)?