Composer - how to install only dev dependencies?

Question

PHP

For example, I have 2 configuration classes for an application.
During development, I want composer to pull one package of dependencies, and another for production.
There is an option --no-dev, it ignores dependencies that are written in require-dev, but how can I make composer take dependencies from require-dev only and ignore the rest?
If you have any ideas, please share. It would also be great if you share your experience of storing configs for development and production.
Thank you!

Answer 1

Are you sure you're doing everything right? :)
Give a situation when a package from production is not needed on a dev