Error when trying the tutorial: sheet-router: tree must be an array

Expected behavior

App expected to run in the browser. Other files run without problems.

Actual behavior

When trying to run with index.js as described in https://yoshuawuyts.gitbooks.io/choo/content/02_your_first_app.html getting the error in browser console:

assert.js:59 Uncaught AssertionError: sheet-router: tree must be an array

Steps to reproduce behavior

Following the exact instructions in https://yoshuawuyts.gitbooks.io/choo/content/02_your_first_app.html

Reduced to the simplest form:

const choo = require('choo')
const html = require('choo/html')
const app = choo()

app.model({
  state: {}
})

const view = (state, prev, send) => {
  return html``
}

app.router((route) => [
  route('/', view)
])

const tree = app.start()
document.body.appendChild(tree)

Still getting the error in the console

[dmitriz]

I was able to fix the problem by changing the router declaration to

app.router(
  ['/', view]
)

Perhaps the router expects an array rather than function?

[timwis]

Fixed thx!