Deprecation: #78668 - TypoScript option config.mainScript

See forge#78668

Description

The TypoScript option config.mainScript allows to set the frontend entrypoint from "index.php" to something else, and is respected when links are built, but not when e.g. previewing a page from the backend. This option has been marked as deprecated.

Impact

Setting this TypoScript option will trigger a deprecation log entry in the admin panel.

Affected Installations

Any installation using this TypoScript option.