Wrap text by splitting the lines based on whitespace and a maximum number of characters.

wrapText.js

function wrapText(str, opt_max) {
  opt_max = Math.min(Math.max(1, ~~opt_max || 80), 200);
  let rgx = new RegExp(`\\S{1,${opt_max}}|\\s{1,${opt_max}}`, 'g');
  let lastPart, wasNotWS;
  return (str.match(rgx) || []).reduce(function (lines, part, partIndex, parts) {
    let isNotWS = /\S/.test(part);
    if (isNotWS) {
      let lineCount = lines.length;
      let lastLine = lines[lineCount - 1];
      let newLastLine;
      if (partIndex > 0 && (newLastLine = lastLine + (wasNotWS ? '' : lastPart) + part).length <= opt_max) {
        lines[lineCount - 1] = newLastLine;
      }
      else {
        lines[lineCount] = part;
      }
    }
    lastPart = part;
    wasNotWS = isNotWS;

    return lines;
  }, []).join('\r\n');
}