lit-plugin generates warnings about the lack of a type wherever I use @property() with no arguments. I've tried setting no-expressionless-property-binding and no-unknown-property-converter to off, but neither disables the warnings. I've seen a reference to a no-unknown-lit-element-property-type in another issue, but there doesn't seem to be a corresponding entry in the settings GUI, and adding it manually to the JSON doesn't disable the warnings either.