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Title	Object type	File name	Summary
hook_field_widget_single_element_WIDGET_TYPE_form_alter	function	core/modules/field/field.api.php	Alter widget forms for a specific widget provided by another module.
hook_field_widget_third_party_settings_form	function	core/modules/field_ui/field_ui.api.php	Allow modules to add settings to field widgets provided by other modules.
hook_file_copy	function	core/modules/file/file.api.php	Respond to a file that has been copied.
hook_file_download	function	core/lib/Drupal/Core/File/file.api.php	Control access to private file downloads and specify HTTP headers.
hook_file_move	function	core/modules/file/file.api.php	Respond to a file that has been moved.
hook_file_url_alter	function	core/lib/Drupal/Core/File/file.api.php	Alter the URL to a file.
hook_filter_format_disable	function	core/modules/filter/filter.api.php	Perform actions when a text format has been disabled.
hook_filter_info_alter	function	core/modules/filter/filter.api.php	Perform alterations on filter definitions.
hook_filter_secure_image_alter	function	core/modules/filter/filter.api.php	Alters images with an invalid source.
hook_form_alter	function	core/lib/Drupal/Core/Form/form.api.php	Perform alterations before a form is rendered.
hook_form_BASE_FORM_ID_alter	function	core/lib/Drupal/Core/Form/form.api.php	Provide a form-specific alteration for shared ('base') forms.
hook_form_FORM_ID_alter	function	core/lib/Drupal/Core/Form/form.api.php	Provide a form-specific alteration instead of the global hook_form_alter().
hook_form_system_theme_settings_alter	function	core/lib/Drupal/Core/Render/theme.api.php	Allow themes to alter the theme-specific settings form.
hook_help	function	core/modules/help/help.api.php	Provide online user help.
hook_help_section_info_alter	function	core/modules/help/help.api.php	Perform alterations on help page section plugin definitions.
hook_help_topics_info_alter	function	core/modules/help/help.api.php	Perform alterations on help topic definitions.
hook_icon_pack_alter	function	core/lib/Drupal/Core/Render/theme.api.php	Alter icon pack definitions.
hook_image_effect_info_alter	function	core/modules/image/image.api.php	Alter the information provided in \Drupal\image\Annotation\ImageEffect.
hook_image_style_flush	function	core/modules/image/image.api.php	Respond to image style flushing.
hook_include.inc	file	core/tests/Drupal/Tests/Core/Extension/modules/module_handler_test/hook_include.inc
hook_install	function	core/lib/Drupal/Core/Extension/module.api.php	Perform setup tasks when the module is installed.
hook_install_tasks	function	core/lib/Drupal/Core/Extension/module.api.php	Return an array of tasks to be performed by an installation profile.
hook_install_tasks_alter	function	core/lib/Drupal/Core/Extension/module.api.php	Alter the full list of installation tasks.
hook_jsonapi_entity_field_filter_access	function	core/modules/jsonapi/jsonapi.api.php	Restricts filtering access to the given field.
hook_jsonapi_entity_filter_access	function	core/modules/jsonapi/jsonapi.api.php	Controls access when filtering by entity data via JSON:API.
hook_jsonapi_ENTITY_TYPE_filter_access	function	core/modules/jsonapi/jsonapi.api.php	Controls access to filtering by entity data via JSON:API.
hook_js_alter	function	core/lib/Drupal/Core/Render/theme.api.php	Alters JavaScript before it is presented on the page.
hook_js_settings_alter	function	core/lib/Drupal/Core/Render/theme.api.php	Perform necessary alterations to the JavaScript settings (drupalSettings).
hook_js_settings_build	function	core/lib/Drupal/Core/Render/theme.api.php	Modify the JavaScript settings (drupalSettings).
hook_language_fallback_candidates_alter	function	core/modules/language/language.api.php	Allow modules to alter the language fallback candidates.
hook_language_fallback_candidates_OPERATION_alter	function	core/modules/language/language.api.php	Allow modules to alter the fallback candidates for specific operations.
hook_language_negotiation_info_alter	function	core/modules/language/language.api.php	Perform alterations on language negotiation methods.
hook_language_switch_links_alter	function	core/lib/Drupal/Core/Language/language.api.php	Perform alterations on language switcher links.
hook_language_types_info	function	core/modules/language/language.api.php	Define language types.
hook_language_types_info_alter	function	core/modules/language/language.api.php	Perform alterations on language types.
hook_layout_alter	function	core/core.api.php	Allow modules to alter layout plugin definitions.
hook_library_info_alter	function	core/lib/Drupal/Core/Render/theme.api.php	Alter libraries provided by an extension.
hook_library_info_build	function	core/lib/Drupal/Core/Render/theme.api.php	Add dynamic library definitions.
hook_link_alter	function	core/lib/Drupal/Core/Utility/link.api.php	Alter the parameters for links.
hook_loader_test.info.yml	file	core/modules/system/tests/modules/HookLoader/hook_loader_test/hook_loader_test.info.yml	core/modules/system/tests/modules/HookLoader/hook_loader_test/hook_loader_test.info.yml
hook_locale_translation_projects_alter	function	core/modules/locale/locale.api.php	Alter the list of projects to be updated by locale's interface translation.
hook_local_tasks_alter	function	core/lib/Drupal/Core/Menu/menu.api.php	Alter local tasks plugins.
hook_mail	function	core/core.api.php	Prepares a message based on parameters.
hook_mail_alter	function	core/core.api.php	Alter an email message created with MailManagerInterface->mail().
hook_mail_backend_info_alter	function	core/core.api.php	Alter the list of mail backend plugin definitions.
hook_media_source_info_alter	function	core/modules/media/media.api.php	Alters the information provided in \Drupal\media\Annotation\MediaSource.
hook_menu_links_discovered_alter	function	core/lib/Drupal/Core/Menu/menu.api.php	Alters all the menu links discovered by the menu link plugin manager.
hook_menu_local_actions_alter	function	core/lib/Drupal/Core/Menu/menu.api.php	Alter local actions plugins.
hook_menu_local_tasks_alter	function	core/lib/Drupal/Core/Menu/menu.api.php	Alter local tasks displayed on the page before they are rendered.
hook_migrate_MIGRATION_ID_prepare_row	function	core/modules/migrate/migrate.api.php	Allows adding data to a row for a migration with the specified ID.

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