code: function formatNodeValue(node, profile) {
  	if (node.value != null && reNl.test(node.value)) {
  		const indent = profile.indent(1);
  		return splitByLines(node.value).map((line, i) => `${indent}${i ? ' ' : '|'} ${line}`).join('\n');
  	}
  
  	return node.value;
  }
docs: Formats value of given node: for multiline text we should precede each
  line with `| ` with one-level deep indent
  @param  {Node} node
  @param  {Profile} profile
  @return {String|null}