### Expected behavior

```javascript
var html = require('choo/html')
var choo = require('choo')

var app = choo()
app.use(productStore)
app.route('/product/:id', mainView)
app.mount('body')

function mainView (state, emit) {

return html`

product is ${state.product.name}

`
function pullData(){
emitter.emit('fetchProduct');
}
}

function productStore (state, emitter) {
emitter.on('fetchProduct', function () {
fetch('/product/'+state.params.id,function (product) {
state.product = product;
emitter.emit('render')
})
})
}
```
I was wondering if this is a good pattern in order to fetch some data when access some URL.

Start with the app.route, mainView, and productStore entry points shown in the issue, and read how route parameters and store events are handled. Determine whether the requested pattern is documented or requires a framework change; done would require a clearly agreed approach, since the issue does not define a specific implementation or test.

Written by the indexing model from the issue text.