code: def is_myst_available():
      """Whether the markdown-it-py package is available."""
      return MarkdownIt is not None
  
imports: import json
  import re
  import warnings
  from textwrap import dedent
  import nbformat
  import yaml
  from .cell_to_text import three_backticks_or_more
label_desc: Use image node_id 1 for calling a global function with example usage: is_myst_available() and returns: unknown