Error: Cannot find tsconfig.json file

I've ran `npm install` at the start folder of the first exercise. Then, when I try to run `npm start`, I get the following error message:

> npm ERR! missing script: start

If I say `npm run serve`:

> Error: Cannot find "...tsconfig.json" file.

Start in the first exercise's start folder and reproduce the setup with `npm install`, `npm start`, and `npm run serve`. Trace why `npm start` has no script and why `npm run serve` cannot find `tsconfig.json`; done means the exercise starts without either error.

Written by the indexing model from the issue text.