docs: def flatten_egginfo_json(
          pkg_names, filename=DEFAULT_JSON, dep_keys=DEP_KEYS, working_set=None):
      """
      A shorthand calling convention where the package name is supplied
      instead of a distribution.
  
      Originally written for this:
  
      Generate a flattened package.json with packages `pkg_names` that are
      already installed within the current Python environment (defaults
      to the current global working_set which should have been set up
      correctly by pkg_resources).
      """
  
      working_set = working_set or default_working_set
      # Ensure only grabbing packages that exists in working_set
      dists = find_packages_requirements_dists(
          pkg_names, working_set=working_set)
      return flatten_dist_egginfo_json(
          dists, filename=filename, dep_keys=dep_keys, working_set=working_set)