A developer has created a calculator using only TypeScript types, showcasing the power and versatility of the language. The project, dubbed "The Useless Type Calculator," demonstrates how TypeScript's type system can be used to create Turing-complete systems, similar to games like Minecraft or Magic: The Gathering. The calculator is implemented as a series of conditional types, leveraging features like tuple length and recursive types to perform arithmetic operations.

Source: https://dev.to/aamulumi/the-useless-type-calculator-in-typescript-f3c