route-decorators for Koa/Express

ES7 decorators that simplify Koa and Express route creation. Using these decorators, you can write your controllers like below and have all the routes populated.

Koa

import {controller, get, post} from 'route-decorators'

@controller('/users', middleware1)
class UserCtrl {

  @get('/:id', middleware2, middleware3)
  async get(context, next) {}

  @post(middleware2)
  async post(context, next) {}
}

Express

import {controller, get, post} from 'route-decorators'

@controller('/users', middleware1)
class UserCtrl {

  @get('/:id', middleware2, middleware3)
  async get(req, res, next) {}

  @post(middleware2)
  async post(req, res, next) {}
}

Once the decorators are applied, every controller instance will receive a $routes array, which you can use to define actual Koa/Express routes.

Assume the above UserCtrl definition, you can define routes in UserCtrl's constructor (although really you can put the code anywhere) as follows:

Koa

import Router from 'koa-66'

// Inside controller constructor
this.router = new Router()
for (const {method, url, middleware, fnName} of this.$routes) {
  this.router[method](url, ...middleware, this[fnName].bind(this))
}

Express

import express from 'express'

// Inside controller constructor
this.router = express.Router()
for (const {method, url, middleware, fnName} of this.$routes) {
  this.router[method](url, ...middleware, (req, res, next) => {
    this[fnName](req, res, next).catch(next)
  })
}

You can move the above logic to some base controller in your app and reuse it for every controller. For example:

class BaseCtrl {
  constructor() {
    this.router = new Router()
    for (const {method, url, middleware, fnName} of this.$routes) {
      this.router[method](url, ...middleware, this[fnName].bind(this))
    }
  }
}

@controller(...)
class UserCtrl extends BaseCtrl {
  // decorated methods as above
}

Decorators

• @controller(path: optional, ...middleware: optional)
• @route(method, path: optional, ...middleware: optional)
• @head, @options, @get, @post, @put, @patch, @del, @delete, @all: wrappers of @route that automatically supply the method argument.

Test

npm install
npm test