/usr/lib/x86_64-linux-gnu/qt5/qml/org/kde/kwin/decoration/qmldir is in kwin-common 4:5.12.4-0ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 | module org.kde.kwin.decoration
plugin decorationplugin
Decoration 0.1 Decoration.qml
DecorationButton 0.1 DecorationButton.qml
MenuButton 0.1 MenuButton.qml
AppMenuButton 0.1 AppMenuButton.qml
ButtonGroup 0.1 ButtonGroup.qml
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