README.md

 ▄▄▄▄▄▄▄▄▄▄▄  ▄▄▄▄▄▄▄▄▄▄▄               ▄▄▄▄▄▄▄▄▄▄▄  ▄▄▄▄▄▄▄▄▄▄▄  ▄
▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌             ▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░▌
 ▀▀▀▀█░█▀▀▀▀ ▐░█▀▀▀▀▀▀▀▀▀              ▐░█▀▀▀▀▀▀▀▀▀ ▐░█▀▀▀▀▀▀▀█░▌▐░▌
     ▐░▌     ▐░▌                       ▐░▌          ▐░▌       ▐░▌▐░▌
     ▐░▌     ▐░█▄▄▄▄▄▄▄▄▄  ▄▄▄▄▄▄▄▄▄▄▄ ▐░█▄▄▄▄▄▄▄▄▄ ▐░▌       ▐░▌▐░▌
     ▐░▌     ▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░░░░░░░░░░░▌▐░▌       ▐░▌▐░▌
     ▐░▌      ▀▀▀▀▀▀▀▀▀█░▌ ▀▀▀▀▀▀▀▀▀▀▀  ▀▀▀▀▀▀▀▀▀█░▌▐░█▄▄▄▄▄▄▄█░▌▐░▌
     ▐░▌               ▐░▌                       ▐░▌▐░░░░░░░░░░░▌▐░▌
     ▐░▌      ▄▄▄▄▄▄▄▄▄█░▌              ▄▄▄▄▄▄▄▄▄█░▌ ▀▀▀▀▀▀█░█▀▀ ▐░█▄▄▄▄▄▄▄▄▄
     ▐░▌     ▐░░░░░░░░░░░▌             ▐░░░░░░░░░░░▌        ▐░▌  ▐░░░░░░░░░░░▌
      ▀       ▀▀▀▀▀▀▀▀▀▀▀               ▀▀▀▀▀▀▀▀▀▀▀          ▀    ▀▀▀▀▀▀▀▀▀▀▀

This is a SQL database implemented purely in TypeScript type annotations.
This means that it operates solely on types - you define a "database" (just a type annotation) and then query it using some more type annotations.

It supports a subset of SQL, including SELECT (with conditions and joins), INSERT, UPDATE and DELETE statements.

See the live demo

You can install ts-sql in your own project with npm install @codemix/ts-sql or yarn add @codemix/ts-sql (TypeScript 4.1 is required).

An example query looks like this:

import { Query } from "@codemix/ts-sql";

const db = {
  things: [
    { id: 1, name: "a", active: true },
    { id: 2, name: "b", active: false },
    { id: 3, name: "c", active: true },
  ],
} as const;

type ActiveThings = Query<
  "SELECT id, name AS nom FROM things WHERE active = true",
  typeof db
>;

// ActiveThings is now equal to the following type:
type Expected = [{ id: 1; nom: "a" }, { id: 3; nom: "c" }];

See the full demo on the TypeScript playground!