Deprecation: #80491 - BackendController inclusion hooks

See Issue #80491

Description

The hook within BackendController $TYPO3_CONF_VARS["typo3/backend.php"]["additionalBackendItems"] has been marked as deprecated.

Loading ExtJS module JS/CSS files via ExtensionManagementUtility::addExtJSModule() inside the module configuration has been deprecated.

Calling BackendController->addJavascriptFile(), BackendController->addJavascript() and BackendController->addCssFile() will trigger a deprecation log entry.

Impact

Registering a hook via $TYPO3_CONF_VARS["typo3/backend.php"]["additionalBackendItems"] and then calling the Backend main page will trigger a deprecation log warning.

Registering any backend module which should load a global CSS/JS file within a module configuration will trigger a deprecation log warning.

Calling any of the methods above will trigger a deprecation log warning.

Affected Installations

Any installation using the hook or PHP methods directly in a custom extension, or using any of the public methods above in a custom PHP script.

Migration

Use the "constructPostProcess" hook within BackendController to load additional resources to achieve the same functionality.