do i run ts scripts or do i compile them to js code example

Example 1: how to run typescript file

npx ts-node src/foo.ts

Example 2: how to compile ts in cmd

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