NPM Difference between dep and devDep. Where to install eslint, prettier?

Question

npm

Hello, if I'm not mistaken,

dependencies

it is set that when building (result) will be used in the project, and with the prefix

dev

, then what is used for development, right? I think it's better to install eslint and prettier in a section

devDependencies

. But I'm reading a guide for installing these modules, and the author uses

-d

, which is respectively set in

dependencies

and this is where I confused myself. Maybe I'm wrong and prettier with eslint needs to be installed in the section

dependencies

Answer 1

`npm install` saves any specified packages into `dependencies` by default.
Additionally, you can control where and how they get saved with some
additional flags:
* `-P, --save-prod`: Package will appear in your `dependencies`. This is the
default unless `-D` or `-O` are present.
* `-D, --save-dev`: Package will appear in your `devDependencies`.
* `-O, --save-optional`: Package will appear in your `optionalDependencies`.
* `--no-save`: Prevents saving to `dependencies`.

https://docs.npmjs.com/cli/v6/commands/npm-install