Install

Tu is published to npm under the @tu-lang/* scope (and create-tu for the project starter). It is currently pre-alpha — the latest tag is not used; releases land on the alpha tag.

Use Tu in a project

Compiler + runtime + Vite plugin

pnpm add -D @tu-lang/vite@alpha @tu-lang/compiler@alpha
pnpm add @tu-lang/runtime@alpha @tu-lang/dom@alpha

@tu-lang/runtime is universal — Signals, vnode construction, SSR helpers (renderToString, renderPageAsync, renderToStream, Suspense). @tu-lang/dom is the browser side — mount, hydrate, defineCustomElement, plus typed re-exports of common DOM types. Server-only consumers (Node SSR, edge functions) only need @tu-lang/runtime. See LANGUAGE: Runtime + platform packages.

// vite.config.ts
import { defineConfig } from 'vite'
import tu from '@tu-lang/vite'

export default defineConfig({
  plugins: [tu()],
})

Now any *.tu file in your project gets compiled on import.

Scaffold a fresh project

pnpm create tu my-app
cd my-app
pnpm dev

(create-tu is the npm starter template; the v0.1 version is minimal — expect rough edges.)

Type-check `.tu` files in CI

pnpm add -D @tu-lang/cli@alpha
pnpx tu check src/**/*.tu

VS Code: syntax + LSP

The VS Code extension (vscode-tu) is not yet on the Marketplace. Two ways to use it today:

Option A — install from a `.vsix` (when published)

The Marketplace listing and a .vsix artifact under Releases are planned but not yet published. Until then, use Option B.

Option B — clone + dev-install

git clone https://github.com/mowtwo/tu
cd tu
pnpm install
pnpm --filter vscode-tu dev:install

Then in VS Code: Cmd+Shift+P → “Developer: Reload Window”. Tu syntax highlighting, diagnostics squiggles, hover, completion, goto-definition, and rename all light up.

TextMate grammar (for other editors / tooling)

The same grammar that drives the VS Code extension and the syntax highlighting on this site:

tu.tmLanguage.json

Drop it into any TextMate-compatible editor (Sublime, Atom, Nova, …) or feed it to Shiki / highlight.js / a custom highlighter.

AI agent skill

If you’re an LLM (or driving one), the skill page is written for direct ingestion — copy the markdown into a system prompt, save it as .claude/skills/tu/SKILL.md, or fetch the plain-text mirror at /llms.txt.

What’s published

Package	Role	Stage
`@tu-lang/runtime`	Signal cells + DOM glue (`h`, `mount`, `hydrate`, `renderToString`, `Fragment`, `defineCustomElement`)	alpha
`@tu-lang/compiler`	Lexer / parser / codegen / source maps	alpha
`@tu-lang/vite`	Vite plugin — load `.tu` modules on import	alpha
`@tu-lang/lsp`	Language server (diagnostics + hover + completion + def + rename)	alpha
`@tu-lang/cli`	`tu build` / `tu dev` / `tu check` / `tu fmt`	alpha
`@tu-lang/format`	Prettier plugin (dprint port later)	alpha
`@tu-lang/std`	Standard library — placeholder	alpha
`create-tu`	`npm create tu` scaffold	alpha

Source for everything: github.com/mowtwo/tu.