code: def setup(app):
      app.add_directive("fbcode", FbcodeDirective)
  
      return {
          "version": "0.1",
          "parallel_read_safe": True,
          "parallel_write_safe": True,
      }
  
imports: import os
  from docutils import nodes
  from sphinx.util.docutils import SphinxDirective
  from sphinx.util.nodes import nested_parse_with_titles
label_desc: Use image node_id 1 for calling a global function with example usage: setup(app) and returns: dict