code: function extractComments (contents) {
    let context = 'idle'
    const lines = []
    contents.split('\n').forEach((line) => {
      if (line.trim() === '/**') {
        context = 'in'
        return
      }
  
      if (line.trim() === '*/') {
        context = 'out'
        return
      }
  
      if (context === 'in') {
        lines.push(line.replace(/\*/g, '').replace(/^\s\s/, ''))
      }
    })
    return lines.join('\n')
  }
docs: Extract comments from the top of the file. Also this method
  assumes, each block of content has only one top of comments
  section.
  
  @method extractComments
  
  @param  {String}        contents
  
  @return {String}