code: function extractLiterals(stats, args) {
      if (stats.getType() != null && (stats.getType() === "installed" || stats.getType() === "builtin")) {
          extractLiteralFromInstalled(stats, args);
      }
  
      if (stats.getType() != null && stats.getType() === "def") {
          extractLiteralFromDef(stats, args[0]);
      }
  
      if (stats.getType() != null && (stats.getType() === "main" || stats.getType() === "remap")) {
          extractLiteralFromMain(stats, args[0]);
      }
  }
docs: extract literal from AST tree.