code: async function renderSass (opts = {}) {
    const tpl = await fs.readFile(path.resolve(__dirname, 'sass.ejs'), 'utf8');
    return ejs.render(tpl, opts);
  }
docs: Renders the sass file using the `sass.ejs` template.
  
  @param {object} opts Option for the generation.
  @param {string} opts.fontName Name of the font to render.
  @param {string} opts.embed Whether or not to embed the fonts defined in the
  `fonts` option.
  @param {object} opts.fonts Fonts to use. Only `woff` and `woff2` are supported.
  The object key should be the font type and each should have
  a contents in Buffer format and a path to  the font File.
  The path is not needed if embed is set to `true`. Example:
  woff: {
  contents: Buffer
  path: String
  }
  @param {string} opts.authorName Name of the font author.
  Will go into the style header comment.
  @param {string} opts.authorUrl Url of the font author.
  Will go into the style header comment.
  @param {string} opts.className Class name / sass placeholder to use.
  @param {array} opts.icons List of icons. Each should have a `name` and
  `codepoint` properties.boolean
  @param {boolean} opts.sassPlaceholder Whether or not to use sass placeholders.
  @param {boolean} opts.cssClass Whether or not to use css classes.
  @param {string} opts.dateFormatted Generation date.
  Will go into the style header comment.
  
  @returns {string} Rendered data