code: function isDirective(node, sourceCode) {
      return (
          node.type === "ExpressionStatement" &&
          (
              node.parent.type === "Program" ||
              (
                  node.parent.type === "BlockStatement" &&
                  astUtils.isFunction(node.parent.parent)
              )
          ) &&
          node.expression.type === "Literal" &&
          typeof node.expression.value === "string" &&
          !astUtils.isParenthesised(sourceCode, node.expression)
      );
  }
docs: Check whether the given node is a directive or not.
  @param {ASTNode} node The node to check.
  @param {SourceCode} sourceCode The source code object to get tokens.
  @returns {boolean} `true` if the node is a directive.