Tips for merging individual Koa-Routers using Typescript

My approach to organizing routers in my project involved categorizing them based on their purpose. Here's how they are structured:

routers/homeRouter.ts

import * as Router from 'koa-router';

const router: Router = new Router();

router
    .get('/', async (ctx, next) => {
        ctx.body = 'hello world';
    });

export = router;

routers/userRouter.ts

import * as Router from 'koa-router';
import UserController = require('../controller/userController');

const router: Router = new Router(
    {
        prefix: 'users'
    }
);

var userController = new UserController();

router
    .post('/user/:email/:password', userController.signUp);

export = router;

As it stands, I have to import each router individually in my app.ts file, like so:

app.ts

import * as Koa from 'koa';
import * as homeRouter from './routers/homeRouter';
import * as userRouter from './routers/userRouter';
const app: Koa = new Koa();
app
    .use(homeRouter.routes())
    .use(homeRouter.allowedMethods());
app
    .use(userRouter.routes())
    .use(userRouter.allowedMethods());
app.listen(3000);

However, I aim to simplify this process as follows:

app.ts

import * as Koa from 'koa';
import * as routers from './routers';
const app: Koa = new Koa();
app
    .use(routers.routes())
    .use(routers.allowedMethods());
app.listen(3000);

Unfortunately, I'm unsure of how to properly export the routers to achieve this consolidated import. Any assistance on this matter would be greatly appreciated.

Answer №1

Here is an example setup:

userRoutes.ts

import * as Router from 'koa-router';

const router = new Router();
router.get('/', list);

...

export default router.routes();

routes.ts

import * as Router from 'koa-router';


import UserRoutes from './userRoutes';
import HomeRoutes from './homeRoutes';

const apiRouter = new Router({ prefix: '/api'});
apiRouter.use('/users', UserRoutes);
apiRouter.use('/home', HomeRoutes);

export default apiRouter.routes();

You can create separate routes for each feature, then combine them into a single router that you can include in your app.ts file.

Answer №2

Meseret is a fantastic TypeScript library created by me to assist with organizing Koa server routers, middleware, and more.

For example, you can easily replace your app.ts with the following code snippet.

import { ServerApp } from 'meseret'

import HomeRouter from './routers/homeRouter'
import UserRouter from './routers/userRouter'

new ServerApp({
  name: 'Your App Name',
  httpServers: [
    { port: 3000 }
  ],
  routers: [
    HomeRouter,
    UserRouter
  ]
}).start() // returns a Promise

All you need to do is import your koa-router Routers and add them to the routers list in the ServerApp.

Meseret offers more than just router management. It includes features like Koa sessions, static caching, serving directories publicly, response compression, and the ability to add your own Koa middleware to the app.

Additionally, it can connect to MongoDB and assist in managing Mongoose models with added static type support through the ModelFactory.

Support for Socket.IO web sockets is also included in the configuration.

All of these features can be accessed within a single ServerApp instance.

For more information, visit Meseret's GitHub page.

I hope this library will assist you in managing your distributed node server project.

Answer №3

I created a tool some time ago that allows you to combine multiple instances of koa-router into a single middleware. Recently, I added a TypeScript definition file to make it compatible for TypeScript users. Simply run npm install koa-combine-routers and implement it in this way:

Instructions:

app.js

import * as Koa from 'koa'
import router from './router'

const app = new Koa()

app.use(router())

routes.js

import * as Router from 'koa-router'
import * as combineRouters from 'koa-combine-routers'

const dogRouter = new Router()
const catRouter = new Router()

dogRouter.get('/dogs', async ctx => {
  ctx.body = 'ok'
})

catRouter.get('/cats', async ctx => {
  ctx.body = 'ok'
})

const router = combineRouters(
  dogRouter, 
  catRouter
)

export default router

This will utilize both .routes() and .allowedMethods().

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