http レスポンスの処理とロジックの処理を分離させたい。

example.js

get('/tanka/:id', 'html', async (datas) => {
  var { param, query } = datas
  var { tanka, author, created } = await api.getTanka(param.id)
  return html({ body: yo`<main><h1>${tanka}</h1><p class="author">${author.name}</p></main>` })
})

get('/author/:authorId', [ 200, 'json' ], async (datas) => {
  var { param, query } = datas
  var author = await api.getAuthor(param.authorId)
  var tankas = await api.getTankaList(author.id)
  return tankas
})

post('/tanka/create', 'json', auth(body(async (datas) => {
  var { param, query, _, author } = datas
  var tanka = JSON.parse(_)
  var res = await api.createTanka({ ...tanka, author })
  return res
})))

onError([ 500, { 'content-type': 'text/plain' } ], (error) => {
  return `${String(error)}\n${String(error.stack)}`
})

response.schema.json

{
  "type": "array",
  "items": [
    { "type": "integer" },
    { "$ref": "#/definitions/headers" },
    { "type": "string" }
  ],
  "minItems": 3,
  "definitions": {
    "headers": {
      "type": "object",
      "required": [ "content-type" ],
      "properties": {
        "content-type": {
          "type": "string"
        }
      }
    }
  }
}