def valid_follow_type(follow_type: str):
    """Ensure follow type is valid steemd type."""
    # ABW: should be extended with blacklists etc. (and those should be implemented as next 'state' values)
    supported_follow_types = dict(blog=1, ignore=2)
    assert follow_type in supported_follow_types, "Unsupported follow type, valid types: {}".format(", ".join(supported_follow_types.keys()))
    return supported_follow_types[follow_type]