Nondescript error when trying to edit Exposed Form Style settings in view

Same on my site.

Browser Console:
"
Ein AJAX-HTTP-Fehler ist aufgetreten.
HTTP-Rückgabe-Code: 200
Debugging information follows.
Statustext: parsererror
Antworttext:
Fatal error: Declaration of Drupal\facets\Plugin\better_exposed_filters\filter\Facets::isApplicable($filter = null, array $filter_options = []) must be compatible with Drupal\better_exposed_filters\Plugin\better_exposed_filters\filter\FilterWidgetBase::isApplicable(mixed $filter = null, array $filter_options = []): bool in /var/www/html/web/modules/contrib/facets/src/Plugin/better_exposed_filters/filter/Facets.php on line 74"

the same on 7.0.1

So those errors appear to be from facets and select2.

Maybe we can put some defensive code in but that appears to be the source

In 7.0.x we added typehints since minimum php requirement is 8.1

Wonder if that's the issue.

php8.3.10 at my case

tried to set select2 in bef via direct editing of views config (for field_country_target_id filter)

      exposed_form:
        type: bef
        options:
          submit_button: Apply
          reset_button: true
          reset_button_label: Reset
          exposed_sorts_label: 'Sort by'
          expose_sort_order: true
          sort_asc_label: Asc
          sort_desc_label: Desc
          text_input_required: 'Select any filter and click on Apply to see results'
          text_input_required_format: null
          bef:
            general:
              autosubmit: false
              autosubmit_exclude_textfield: false
              autosubmit_textfield_delay: 500
              autosubmit_hide: false
              input_required: false
              allow_secondary: false
              secondary_label: 'Advanced options'
              secondary_open: false
              reset_button_always_show: false
            sort:
              plugin_id: default
            filter:
              combine:
                plugin_id: default
              field_country_target_id:
                plugin_id: bef_select2
                advanced:
                  placeholder_text: 'Country'
                  rewrite:
                    filter_rewrite_values: ''
                    filter_rewrite_values_key: false
                  collapsible: false
                  collapsible_disable_automatic_open: false
                  is_secondary: false

when viewing the page frontend it goes into the same error:

Fatal error: Declaration of Drupal\select2\Plugin\better_exposed_filters\filter\Select2::defaultConfiguration() must be compatible with Drupal\better_exposed_filters\Plugin\better_exposed_filters\filter\FilterWidgetBase::defaultConfiguration(): array in /var/www/unh-new/web/modules/contrib/select2/src/Plugin/better_exposed_filters/filter/Select2.php on line 21

(but i see no logs in the watchdog)

FilterWidgetBase::defaultConfiguration(). if you remove the typehint does it work?

sorry, i do not understand how to remove it

if you go into the file and change public function defaultConfiguration(): array { to public function defaultConfiguration() {

ideally the other modules would update for modern typehints but know that's the case.

i'm not programmer, just advanced drupal user. can you instruct wher to find the file?

found, better_exposed_filters/src/Plugin/better_exposed_filters/filter/FilterWidgetBase.php line 74
changed.
no changes, the same error

Left a comment on ✨ BEF 7.0 compatible RTBC also

Not thrilled but if other modules are going to break I can drop the typehint here till it's mandatory.

Don't mind reverting this so other contrib modules will function. But when D11 only branch is started may get added back.