ttsc

A typescript-go toolchain for compiler-powered plugins and type-safe execution.

• ttsc: build, check, and transform.
• ttsx: execute TypeScript with type checking.
  • native TypeScript-Go execution instead of transpile-only runners.
  • type checking that tsx does not provide.
• plugin support: compiler-powered libraries, such as typia.
  • @ttsc/lint: lint violations as TS compile errors.

Setup

Install

Install the native TypeScript preview package with ttsc:

npm install -D ttsc @typescript/native-preview

Commands

Run TypeScript directly with ttsx (CLI command):

npx ttsx src/index.ts

Build, check, or watch the project with ttsc:

npx ttsc
npx ttsc --noEmit
npx ttsc --watch

Bundlers

Use @ttsc/unplugin when a bundler owns your build.

It runs ttsc plugins inside supported bundlers.

npm install -D ttsc @typescript/native-preview
npm install -D @ttsc/unplugin

Minimal Vite setup:

// vite.config.ts
import ttsc from "@ttsc/unplugin/vite";
import { defineConfig } from "vite";

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

Supported bundlers:

• Vite
• Rollup
• Rolldown
• esbuild
• Webpack
• Rspack
• Next.js
• Farm
• Bun

See @ttsc/unplugin for full setup and adapter options.

Plugins

Plugins let libraries add compile-time checks, transforms, and type-driven code generation to normal ttsc and ttsx runs.

# compile
npx ttsc

# execute
npx ttsx src/index.ts

Transform Example

A transform uses TypeScript types to generate JavaScript before runtime.

import typia, { tags } from "typia";
import { v4 } from "uuid";

const matched: boolean = typia.is<IMember>({
  id: v4(),
  email: "[email protected]",
  age: 30,
});
console.log(matched); // true

interface IMember {
  id: string & tags.Format<"uuid">;
  email: string & tags.Format<"email">;
  age: number &
    tags.Type<"uint32"> &
    tags.ExclusiveMinimum<19> &
    tags.Maximum<100>;
}

The transform replaces typia.is<IMember>() with dedicated JavaScript checks at build time:

import * as __typia_transform__isFormatUuid from "typia/lib/internal/_isFormatUuid";
import * as __typia_transform__isFormatEmail from "typia/lib/internal/_isFormatEmail";
import * as __typia_transform__isTypeUint32 from "typia/lib/internal/_isTypeUint32";
import typia from "typia";
import { v4 } from "uuid";
const matched = (() => {
  const _io0 = (input) =>
    "string" === typeof input.id &&
    __typia_transform__isFormatUuid._isFormatUuid(input.id) &&
    "string" === typeof input.email &&
    __typia_transform__isFormatEmail._isFormatEmail(input.email) &&
    "number" === typeof input.age &&
    __typia_transform__isTypeUint32._isTypeUint32(input.age) &&
    19 < input.age &&
    input.age <= 100;
  return (input) => "object" === typeof input && null !== input && _io0(input);
})()({
  id: v4(),
  email: "[email protected]",
  age: 30,
});
console.log(matched); // true

List of Plugins

ttsc ships a few small utility plugins in this repository.

• @ttsc/banner: adds @packageDocumentation JSDoc banners.
• @ttsc/lint: reports lint violations as TypeScript compile errors.
• @ttsc/paths: rewrites source path aliases so JS and declaration emit receive relative imports.
• @ttsc/strip: removes configured calls and debugger statements.
• @ttsc/unplugin: runs ttsc plugins inside bundlers supported by unplugin.

Plugin authors should start from the Guide Documents.

Ecosystem plugins are listed below; PRs adding ttsc plugins are welcome.

• nestia: generates NestJS routes, OpenAPI, and SDKs.
• typia: generates validators, serializers, and type-driven runtime code.

References

• TypeScript runners: ts-node and tsx
• Transformer tooling: ttypescript and ts-patch
• Inspired by: typical and tsgonest