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express-coroutineGenerator function and Async function to be used as middlewares in express like koa. ( use lei-coroutine ) Installationnpm install express-coroutine --saveUsageInit expressconst express = require('express-coroutine')(require('express'));const app = express();Init routerconst express = require('express-coroutine')(require('express'));const app = express();const router = new express.Router();app.use(router);router.get('/', function* (req, res) { res.send('it works!');});// also async functionrouter.get('/', async function (req, res) { res.send('it works!');});Write your express routes by using generator functions as middlewares. const express = require('express-coroutine')(require('express'));const app = express();app.get('/user/:id', function* (req, res) { const user = yield User.findById(req.params.id); res.send(user);})app.get('/error', function* (req, res) { throw new Error('Bang!');});// also async functionapp.get('/user2/:id', async function* (req, res) { const user = await User.findById(req.params.id); res.send(user);});app.listen(8000);You can also define multiple generator functions just the express way. const fn = function (req, res, next) { return new Promise((resolve, reject) => { if (req.params.user !== 'a') return reject(new Error('Bang!')); resolve('a'); });};const middleware = function* (req, res, next) { yield fn(req, res, next);};const middleware2 = async function (req, res, next) { await fn(req, res, next); next();};app.get('/:user', middleware, function* (req, res) { res.send('it works!');});app.get('/:user', middleware2, async function (req, res) { res.send('it works!');});More detail demo can be found in test.js Get coroutineconst coroutine = require('express-coroutine').coroutine; |
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