How to skip suggestions when composer installing

As of composer 1.6.3, there is a --no-suggest option that hides all suggestions when running composer install or composer update.

When you run composer install on a project that has a composer.lock file, it just installs the versions locked in the composer.lock file and nothing. In other words, the required packages and versions are already resolved and it's just installing it.

When you run composer install on a project with no composer.lock file, Composer will resolve the required packages and their versions and will store it in the composer.lock file before installing them. In this case, the project was not set up and you get notified about other suggested packages.

In the second case, there is no way you can hide the suggested packages list from the output (at least, at the time of writing this answer). In the first case, nothing is new, so it isn't shown at all.

The solution will be to push your composer.lock file to the server, which is a good practice after all (you don't want your production server to have other versions of the dependencies than your dev environment, newer versions might broke your site).