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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!