I am doing some code challenges using Typescript in VS code. When I try to run the code and see the output, I get "Code Language is not supported or defined". The language mode is set to Typescript React (I also tried just Typescript). And the file has a .tsx ending. Finally, I also did compile the file and make a duplicate .js version. Is there something I am forgetting?

CodePudding user response：

You cannot run a typescript file the way you would run a javascript file. You will need to first compile your typescript file into javascript with the command below in the directory containing your .ts file:

npx tsc -w <your-file-name.ts>

The command above will create a <your-file-name.js> file in the same directory and keep watching for any realtime changes with -w option. Then you can run the .js file in the same directory with either node or nodemon like this:

node <your-file-name.js>

---UPDATE---

Having to input these two commands mentioned above tsc -w and node <your-file-name.js> every time you might get cumbersome after a few times, you can use the ts-node command which combines both of the commands stated above into one:

ts-node <your-file-name.ts>

CodePudding user response：

Run npx tsc -w And in another terminal run node filename.js

CodePudding user response：

Judging by the fact that your file ends with .tsx you are probably using React. I will also assume that you used create-react-app to init your project.

If both of my assumptions are correct, try:

npm start

If you are new to both React and Typescript, I would also suggest taking a look into that tool as it creates a very decent starting point for you to start learning both. https://create-react-app.dev/