Feature: #97898 - TCA option isViewable for page types 

See forge#97898

Description 

A new TCA option isViewable is introduced for page types (doktype) to configure whether a specific page type can be linked to in the page browser and in frontend TypoLink generation.

EXT:my_extension/Configuration/TCA/Overrides/pages.php 
// Disable linking for custom page type
$GLOBALS['TCA']['pages']['types']['116']['isViewable'] = false;
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By default, all page types are viewable unless explicitly set to false.

TYPO3 core now marks the following page types as non-viewable in TCA:

  • Spacer (doktype 199)
  • SysFolder (doktype 254)

The existing TSconfig option TCEMAIN.preview.disableButtonForDokType is also respected when determining viewability in the backend page browser. If a page type is disabled for preview via TSconfig, it is also non-viewable.

Impact 

The viewability of pages can now be configured in TCA, following the same pattern as the allowedRecordTypes option introduced in TYPO3 v14.1. This provides a centralized way to control which page types can be linked.

Extensions with custom page types that should not be viewable can now configure this directly in TCA:

EXT:my_extension/Configuration/TCA/Overrides/pages.php 
$GLOBALS['TCA']['pages']['types'][(string)\MyVendor\MyExtension\Domain\PageType::MY_NON_VIEWABLE_TYPE] = [
    'isViewable' => false,
    'showitem' => '...',
];
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