code: function getBlockContent(tokens, type, markup, start = false) {
    const content = {
      type,
      content: processBlockTokens(tokens.slice(1, -1)), // eslint-disable-line
      markup
    };
    if (start) {
      content.start = start;
    }
    return content;
  }
docs: getBlockContent - Function returns block content
  
  @param tokens
  @param type
  @param markup
  @param start
  @returns {{type: *, content, markup: *}}