Typegres

• Methods on Postgres tables = your API. No routes. No GraphQL. No auto-CRUD.
• Every Postgres function, fully typed. All 77 base types, every operator, nullability tracked at the type level.
• Clients compose typed SQL across the wire. Server validates the surface area you expose.
• Live by default. .live() re-queries when the underlying data changes — pushed directly to clients.

typegres.com/play · demo.mp4 · docs/ARCHITECTURE.md

Usage

Developer preview — surface is settled, edges still being filed. Not yet recommended for production.

npm install typegres pg

import { typegres, Int8, Text, expose } from "typegres";

const db = await typegres({
  type: "pg",
  connectionString: process.env.DATABASE_URL!,
});

class Users extends db.Table("users") {
  @expose() id = (Int8<1>).column({ nonNull: true, generated: true });
  @expose() first_name = (Text<1>).column({ nonNull: true });
  @expose() last_name = (Text<1>).column({ nonNull: true });

  // Derived column — composes back into your typed query API.
  @expose() fullName() {
    return this.first_name["||"](" ")["||"](this.last_name);
  }
}

// `fullName()` works anywhere a column does — select, where, orderBy:
const rows = await Users.from()
  .select(({ users }) => ({
    id: users.id,
    name: users.fullName(),
  }))
  .execute(db);

console.log(rows);
await db.close();

For a complete scaffold with migrations + codegen, see examples/basic. Or try it interactively at typegres.com/play.

How it works

1. Types codegen'd from the Postgres catalog. 77 base types, full method/operator coverage, nullability tracked at the type level.
2. Object-capability queries. Clients can only reach what you've exposed as @expose methods — columns, relations, scoped reads, mutations. The class surface is the contract; the schema underneath is free to move.
3. Object-capability RPC. The query builder ships to a constrained interpreter on the server; only @expose-marked methods reach evaluation.
4. Live queries. .live() watches the predicates your query depends on and re-yields when committed mutations would change the result.

Deeper dive in docs/ARCHITECTURE.md.

Status

• [x] Full pg type system + operator/function codegen
• [x] Query builder (.select + .join + .where + .groupBy + .having + .orderBy + .limit)
• [x] Mutations (.insert / .update / .delete / .returning)
• [x] Subqueries, scalar/array aggregation
• [x] Table codegen from live schema
• [x] Live queries — .live() returns an async iterable that re-yields when committed mutations would change the result
• [x] Capability-rooted RPC — closures composed against @expose-marked classes/methods are serialized, evaluated server-side under a constrained interpreter, and JSON-streamed back

Planned

• [ ] SQLite backend (sql-builder is dialect-aware; adapter is stubbed)
• [ ] pg_notify-driven live updates (currently a single shared polling loop, not per-subscription)
• [ ] WAL-mode for live updates (currently uses an auxiliary table)
• [ ] Cap'n Web transport (in-flight upstream PR; cloudflare/capnweb#162)

Development

Recommended: Nix the package manager

• direnv. The .envrc (use flake) auto-activates the pinned toolchain when you cd into the repo, and bin/startpg works out of the box. Without Nix, point DATABASE_URL at any local Postgres and skip startpg.

./bin/startpg             # one-time dev Postgres socket (Nix)
npm install
npm run check             # lint + typecheck + tests

License

MIT — see LICENSE.