How do I resolve dependency conflicts in Composer?

Question

I'm new to using Composer and I'm having trouble deploying to Laravel Forge. I am getting an error message that says:

Your requirements could not be resolved to an installable set of packages.

Problem 1 - Installation request for illuminate/support v5.5.44 -> satisfiable by illuminate/support[v5.5.44]. - don't install tightenco/collect v5.5.33|don't install illuminate/support v5.5.44 - Installation request for tightenco/collect v5.5.33 -> satisfiable by tightenco/collect[v5.5.33].

I didn't add these packages, they are dependencies of something I have added. So I have a few questions:

First, how do I resolve this? I am thinking that I should not go in and try to change the version numbers on anything because that would break things most likely, correct? Also, since they are not in my composer.json file, I'm not sure how I would do this.

Second, how do I determine what package I am installing uses this as a dependency?

Third, I have a couple of plugins that I have uninstalled in the CP that are still showing up in the composer.json file.Do I need to go back into my composer.json file and remove them? I thought this was done automatically when a plugin was uninstalled, but that may be my mistake. I am wondering if one or more of those plugins might be the culprit.

Thanks,

Brian

Answer 1

I was able to take your composer.json file, run composer update from it without any issues, do an install of Craft from that and update Craft/plugins and install/uninstall Craft/plugins from the Control Panel without any issues.

symfony/yaml v4.1.0 requires php ^7.1.3 -> your PHP version (7.2.14-1+ubuntu18.04.1+deb.sury.org+1) overridden by "config.platform.php" version (7.0) does not satisfy that requirement.

For that one, you've got this in your composer.json file:

  "config": {
    "sort-packages": true,
    "optimize-autoloader": true,
    "platform": {
      "php": "7.0"
    }
  },

Change it to this:

  "config": {
    "sort-packages": true,
    "optimize-autoloader": true,
    "platform": {
      "php": "7.2.14"
    }
  },

And it will go away.