how to compile typescript

1tsc app.ts
2

1npx ts-node src/foo.ts

1tsc app.js

1"scripts": {
2    "clean": "rimraf dist",
3    "start": "npm-run-all clean --parallel watch:build watch:server --print-label",
4    "watch:build": "tsc --watch",
5    "watch:server": "nodemon './dist/index.js' --watch './dist'"
6}