code: function updateContent (content, selection, updated) {
    if (typeof content !== 'string') {
      throw new TypeError('The content value must be a string.')
    }
  
    if (typeof selection !== 'object') {
      throw new TypeError('The selection must be an object.')
    }
  
    if (typeof selection.start !== 'number') {
      throw new TypeError('The selection start value must be a number.')
    }
  
    if (typeof selection.end !== 'number') {
      throw new TypeError('The selection end value must be a number.')
    }
  
    if (typeof updated !== 'string') {
      throw new TypeError('The updated content value must be a string.')
    }
  
    return content.slice(0, selection.start) + updated + content.slice(selection.end)
  }
docs: Update the selected content with the updated content in the given full content
  @param  {string}        content   The full content string
  @param  {SelectionType} selection The selections positions
  @param  {string}        updated   The update slice of content
  @return {string}                  The final updated content string