docs: function parseReactComponent (filename, options) {
    options = options || {}
    let or = options.or || '|'
    let src = fs.readFileSync(filename).toString()
    let parsed = reactDocgen.parse(src)
    for (let name of Object.keys(parsed.props || {})) {
      let prop = parsed.props[ name ]
      switch (prop.type && prop.type.name) {
        case 'union':
          prop.type = {
            name: prop.type.value.map((value) => value.name).join(or)
          }
      }
    }
    return parsed
  }