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29
Readme.md
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@ -13,10 +13,11 @@
Koa is not bundled with any middleware. Koa is not bundled with any middleware.
## Installation ## Installation
Koa requires __node v4.0.0__ or higher for (partial) ES2015 support.
Koa requires __node v7.6.0__ or higher for ES2015 and async function support.
``` ```
$ npm install koa@next $ npm install koa
``` ```
## Hello koa ## Hello koa
@ -49,6 +50,17 @@ Koa is a middleware framework that can take 3 different kinds of functions as mi
Here is an example of logger middleware with each of the different functions: Here is an example of logger middleware with each of the different functions:
### ___async___ functions (node v7.6+)
```js
app.use(async (ctx, next) => {
const start = new Date();
await next();
const ms = new Date() - start;
console.log(`${ctx.method} ${ctx.url} - ${ms}ms`);
});
```
### Common function ### Common function
```js ```js
@ -64,17 +76,6 @@ app.use((ctx, next) => {
}); });
``` ```
### ___async___ functions (Babel required)
```js
app.use(async (ctx, next) => {
const start = new Date();
await next();
const ms = new Date() - start;
console.log(`${ctx.method} ${ctx.url} - ${ms}ms`);
});
```
### GeneratorFunction ### GeneratorFunction
To use generator functions, you must use a wrapper such as [co](https://github.com/tj/co) that is no longer supplied with Koa. To use generator functions, you must use a wrapper such as [co](https://github.com/tj/co) that is no longer supplied with Koa.
@ -120,7 +121,7 @@ app.use(convert(function *(next) {
## Babel setup ## Babel setup
For Node 4.0 and Babel 6.0 you can setup like this: For Node 4.0+ and Babel 6.0 you can setup like this:
```bash ```bash
$ npm install babel-register babel-plugin-transform-async-to-generator --save $ npm install babel-register babel-plugin-transform-async-to-generator --save

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docs/api/index.md
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# Installation # Installation
Koa requires __node v4.0.0__ or higher for (partial) ES2015 support. Koa requires __node v7.6.0__ or higher for ES2015 and async function support.
You can quickly install a supposed version of node with your favorite version manager: You can quickly install a supposed version of node with your favorite version manager:
```bash ```bash
$ nvm install v4.0.0 $ nvm install 7
$ npm i koa $ npm i koa
$ node my-koa-app.js $ node my-koa-app.js
``` ```
## Async Functions with Babel ## Async Functions with Babel
To use `async` functions in Koa, we recommend using [babel's require hook](http://babeljs.io/docs/usage/require/). To use `async` functions in Koa in versions of node < 7.6, we recommend using [babel's require hook](http://babeljs.io/docs/usage/require/).
```js ```js
require('babel-core/register'); require('babel-core/register');