code: async function deleteUnspecifiedTypes(options) {
    const { outputDir, fontName, types } = options
  
    for (let ext of FONT_TYPES) {
      if (types.indexOf(ext) !== -1) { continue }
  
      let filepath = path.resolve(outputDir, `${ fontName }.${ ext }`)
  
      if (await fsAsync.exists(filepath)) {
        await fsAsync.unlink(filepath)
      }
    }
  }
docs: Delete generated fonts with extensions that weren't specified
  
  @param  {Object} options
  @return {void}