Скачать или смотреть Node.js v22.18.0 LTS Type stripping is enabled by default

Type stripping is now enabled by default in Node.js version 22. This is a long term support release. What this means is when you run Node.js, you do not have to manually transpile your TypeScript code to JavaScript.

Node will do it for you. I wanted to try it out, so I got NVM set up, installed Node 22 on my system, and ran a quick test. Normally, if you run TypeScript in a JavaScript environment, you get an error since TypeScript is not valid JavaScript.

For example, if you declare a variable like const foo: string equals "hello"; the ": string" part is TypeScript and JavaScript would throw an error. With Node 22, you can just run this file and it works because Node strips away the type annotation. I tested this with a small script that just logs a message, and it ran fine.

But there are some things you should know. This feature is experimental and has some limits. Node will only remove simple, erasable TypeScript.

More advanced TypeScript features like enums or parameter properties will not work unless you use a special flag, --experimental-transform-types. And keep in mind, Node does not do type checking. It only ignores TypeScript-specific syntax so you do not get any extra safety from typing at runtime.

Also, Node ignores tsconfig.json so settings like paths or using newer JavaScript features are not supported. If you want full TypeScript support, like what tsc or ts-node provides, you still need to use third party tools.