Skip to main content

Third-party transpilers

In transpile-only mode, we skip typechecking to speed up execution time. You can go a step further and use a third-party transpiler to transform TypeScript into JavaScript even faster. You will still benefit from ts-node's automatic tsconfig.json discovery, sourcemap support, and global ts-node CLI. Integrations can automatically derive an appropriate configuration from your existing tsconfig.json which simplifies project boilerplate.

What is the difference between a compiler and a transpiler?

For our purposes, a compiler implements TypeScript's API and can perform typechecking. A third-party transpiler does not. Both transform TypeScript into JavaScript.

Bundled swc integration#

We have bundled an experimental swc integration.

swc is a TypeScript-compatible transpiler implemented in Rust. This makes it an order of magnitude faster than transpileModule.

To use it, first install @swc/core or @swc/wasm. If using importHelpers, also install @swc/helpers.

npm i -D @swc/core @swc/helpers

Then add the following to your tsconfig.json.

"ts-node": {
"transpileOnly": true,
"transpiler": "ts-node/transpilers/swc-experimental"

swc uses @swc/helpers instead of tslib. If you have enabled importHelpers, you must also install @swc/helpers.

Writing your own integration#

To write your own transpiler integration, check our API docs.

Integrations are require()d, so they can be published to npm. The module must export a create function matching the TranspilerModule interface.