code: function alignment(value, index) {
    var start = value.lastIndexOf(lineFeed, index)
    var end = value.indexOf(lineFeed, index)
    var char
  
    end = end === -1 ? value.length : end
  
    while (++start < end) {
      char = value.charAt(start)
  
      if (
        char !== colon &&
        char !== dash &&
        char !== space &&
        char !== verticalBar
      ) {
        return false
      }
    }
  
    return true
  }
docs: Check if `index` in `value` is inside an alignment row.