src/client/components/PlainMarkdownInput/slate/tokenizer.js
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;
}
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;
}
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 ; }
getBlockContent - Function returns block content

@param tokens
@param type
@param markup
@param start
@returns {{type: *, content, markup: *}}
getBlockContent - Function returns block content