code: def migrate_viz() -> None:
      """
      Migrate a viz from one type to another.
      """
  
file_path: superset/superset/cli/viz_migrations.py
imports: from enum import Enum
  import click
  from click_option_group import optgroup, RequiredMutuallyExclusiveOptionGroup
  from flask.cli import with_appcontext
  from superset import db
label_desc: Use image node_id 1 for calling a global function with example usage: migrate_viz() without return types