Add array return to all hook_theme_suggestions_HOOK implementations

@mstrelan

After step reproduce in Drupal version 11.x-dev and checkout branch.

So the MR!10964 looks good to me. That's why moving this issue to RTBC!

Thank you!!

I applied the diff and searched and still see instances without a return type. Is there a reason these are excluded?

(11.x)$ git grep  "function.*_theme_suggestions" | grep ") {" 
core/lib/Drupal/Core/Render/theme.api.php: * function node_theme_suggestions_node(array $variables) {
core/lib/Drupal/Core/Render/theme.api.php: * function MY_MODULE_theme_suggestions_alter(array &$suggestions, array &$variables, $hook) {
core/lib/Drupal/Core/Render/theme.api.php:function hook_theme_suggestions_alter(array &$suggestions, array &$variables, $hook) {
core/lib/Drupal/Core/Render/theme.api.php: * function MY_MODULE_theme_suggestions_node_alter(array &$suggestions, array $variables) {
core/lib/Drupal/Core/Render/theme.api.php:function hook_theme_suggestions_HOOK_alter(array &$suggestions, array &$variables) {
core/modules/big_pipe/big_pipe.module:function big_pipe_theme_suggestions_big_pipe_interface_preview(array $variables) {
core/modules/node/node.module:function node_theme_suggestions_node(array $variables) {
core/modules/views_ui/views_ui.module:function views_ui_theme_suggestions_views_ui_view_preview_section(array $variables) {

Looks like I missed some.

Fixed and added to the IS:

• node_theme_suggestions_node
• big_pipe_theme_suggestions_big_pipe_interface_preview
• views_ui_theme_suggestions_views_ui_view_preview_section

These are alter hooks that return void and have not been updated here.

• MY_MODULE_theme_suggestions_alter
• hook_theme_suggestions_alter
• MY_MODULE_theme_suggestions_node_alter
• hook_theme_suggestions_HOOK_alter