Uncaught Error: Class "Drupal\search_api\Entity\Index" not found in facets.module:393

I think this is a dependency declaration or a dependency issue. I had the same problem while trying to install fancy_file_delete module which has a dependency to views_bulk_operations. Facets module had been installed and enabled just before. I didn't explore further as I did'nt have timefor this and fancy_file_delete is not essential for what I'm doing, so I gave it up without installing the module.

$ composer require 'drupal/fancy_file_delete:^2.0'
./composer.json has been updated
Running composer update drupal/fancy_file_delete
Loading composer repositories with package information
Updating dependencies
Lock file operations: 2 installs, 0 updates, 0 removals
  - Locking drupal/fancy_file_delete (2.0.9)
  - Locking drupal/views_bulk_operations (4.2.5)
Writing lock file
Installing dependencies from lock file (including require-dev)
Package operations: 2 installs, 0 updates, 0 removals
  - Installing drupal/views_bulk_operations (4.2.5): Extracting archive
  - Installing drupal/fancy_file_delete (2.0.9): Extracting archive
Generating autoload files
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No security vulnerability advisories found.
$ drush en fancy_file_delete
The following module(s) will be enabled: fancy_file_delete, views_bulk_operations

 Do you want to continue? (yes/no) [yes]:
 > yes

 [error]  Error: Class "Drupal\search_api\Entity\Index" not found in facets_views_data_alter() (line 393 of /home/athan/domains/aktigram.com/public_html/aktigram/igr_10/web/modules/contrib/facets/facets.module) #0 /home/athan/domains/aktigram.com/public_html/aktigram/igr_10/web/core/lib/Drupal/Core/Extension/ModuleHandler.php(545): facets_views_data_alter()
#1 /home/athan/domains/aktigram.com/public_html/aktigram/igr_10/web/core/modules/views/src/ViewsData.php(245): Drupal\Core\Extension\ModuleHandler->alter()
#2 /home/athan/domains/aktigram.com/public_html/aktigram/igr_10/web/core/modules/views/src/ViewsData.php(154): Drupal\views\ViewsData->getData()
... etc

In complement of my previous comment, I could not install any other module (at least feeds which was the next in my list) without having the same problem while enabling the module. I had to uninstall "facets" then I could enable the other modules without the errors above.

I am attaching a hotfix for version 3.0.0-beta1.

Version 3.0.x-dev no longer includes the problematic hook, and seearch_api has been added to the dependencies. See the commit here.

Closing as won't fix, since it's already been fixed in the module itself. We have a hard dependency on Search API now.