bbob/packages/bbob-plugin-helper/lib/index.js

const { getChar, N } = require('./char');

const isTagNode = el => typeof el === 'object' && el.tag;
const isStringNode = el => typeof el === 'string';

const EOL = getChar(N);
const isEOL = el => el === EOL;

const getNodeLength = (node) => {
  if (isTagNode(node)) {
    return node.content.reduce((count, contentNode) => count + getNodeLength(contentNode), 0);
  } else if (isStringNode(node)) {
    return node.length;
  }

  return 0;
};

const appendToNode = (node, value) => {
  node.content.push(value);
};

module.exports = {
  appendToNode,
  getNodeLength,
  isTagNode,
  isStringNode,
  isEOL,
};