npm init -y

npm -i webpack webpack-cli -D

npm -i webpack webpack-cli -g

<script src="./src/index.js"></script>
There are problems with managing JavaScript projects this way:
It is not immediately apparent that the script depends on an external library.
If a dependency is missing, or included in the wrong order, the application will not function properly.
If a dependency is included but not used, the browser will be forced to download unnecessary code.