wrapAt.js

function wrapAt (str, max) {
  if (str.length > max) {
    const parts = str.split(' ')
    let i = 0
    for (let w = 0; i < parts.length; i++) {
      w += parts[i].length
      if (w >= max) {
        parts[i] = `\n${parts[i]}`
        w = 0
      }
    }
    return parts.join(' ')
  } else {
    return str
  }
}