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Use new operator to create a Koa v2 app

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Without it one would get: `TypeError: Class constructors cannot be invoked without 'new'`.
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Julien Fontanet 2016-01-23 14:31:05 +01:00
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@ -25,6 +25,9 @@ $ npm install koa
Koa v2 is currently in alpha. In this new version, the middleware function signature completely changes in favor of ES2015-2016 syntax: Koa v2 is currently in alpha. In this new version, the middleware function signature completely changes in favor of ES2015-2016 syntax:
```js ```js
// Koa application is now a class and requires the new operator.
const app = new Koa()
// uses async arrow functions // uses async arrow functions
app.use(async (ctx, next) => { app.use(async (ctx, next) => {
try { try {