tsc command output empty js file

I encountered a similar issue. I quickly realized that I haven't save the main.ts file on VS code by running:

cat main.ts

In that case, you are basically compiling an empty file. I guess the tutorial did not bother to mention that you should manually save your file.

You first need to save the file. (Ctrl + s). Otherwise compiler will compile an empty file.

So you should manually save the file.