The qmltypes files are parsed by QtCreator to provide a code-completion and some sanity checking for the QML code. Usually these files are generated from the qmlplugindump tool, but has the limitation that it can only work for plugins.

In our examples we don't build a plugin, but export the types directly to the engine. For this usecase it would be handy to have a qmltypes file in the autogenerated folder to still provide code-completion.

Especially for the simulation API which can't be put into a plugin, the autogenerated qmltypes are needed to make the life of the developer easier