Migrate views from D7 to D8.
Once installed on D7 - you need to go to /admin/config/view-migration
It outputs multiple YML files and you're specifying a directory to put them in, which you need to create first.
My experience of the YAML output has been:
- incomplete (e.g. multiple missing displays in a complex view, views without a machine name)
- invalid UTF8 due to the next and previous arrows in pager.options.tags being encoded wrong
- the dependencies section at the top of the file not being set out correctly
It doesn't look like there's much current development activity (likewise migrate_views, which is the other plugin people usually mention).