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@typescript-tsp/tsp

v5.8.0-dev.20250213

Published

TSP is a fork and superset of the TypeScript programming language which aims to implement features incompatible with the goals of TypeScript

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Links

Git

Maintainers

bcheidemannbcheidemann

Keywords

TypeScriptMicrosoftcompilerlanguagejavascript

Readme

TypeScript Plus (TSP)

npm version

TSP is a fork and partial superset of the TypeScript programming language which aims to implement features incompatible with the design goals of TypeScript. This includes breaking change upgrades to legacy features such as enums, as well as maintaining support for valuable language features TypeScript has dropped support for, such as design time type reflection in EcmaScript decorators.

Installing

For the latest stable version:

npm install -D @typescript-tsp/tsp

For our nightly builds:

npm install -D @typescript-tsp/tsp@next

Usage

# Equivalent to `npx tsc`
npx tsp

Motivation

TypeScripts has clear design goals which are intended to minimise deviation from the base JavaScript language. There's nothing wrong with these goals, but they prohibit the development of certain new (and we believe useful) features. The goal of TSP is not to maintain "closeness" with JavaScript. We believe that TypeScript offers one of the best, most flexible type systems available. This project aims to explore what is possible when building upon TypeScript's excellent type system, while embracing the opportunities afforded to us by allowing some strategic breaking changes, and implementing a more expressive syntax which is not bound by the TypeScript design goals.

Documenation

TSP specific features are documented in docs/FEATURES.md. For TypeScript features, please reference the TypeScript Handbook.

Contribute

TSP aims to remain up to date with the latest TypeScript features. As such, if your contribution is not specific to TSP, it should be made in the upstream TypeScript repo. However, if you're interested in contributing to TSP, feel free to open a pull request, or for larger features requiring discussion, please open an issue. You can find developer documentation here.

This project has adopted the Microsoft Open Source Code of Conduct. For more information see the Code of Conduct FAQ or contact [email protected] with any additional questions or comments.

Roadmap

We are currently working on implementing foundational infrastructure, such as patch management and publishing workflows. For now, there is no roadmap for the development of specific features.