start: throw err for render races

2016-05-31 15:54:46 +02:00
parent 7f66f7d4dc
commit 3749ffb477
2 changed files with 18 additions and 0 deletions
@@ -163,6 +163,7 @@ function choo () {
    function onchange (action, newState, oldState) {
      if (newState === oldState) return
      const oldTree = document.querySelector('#' + rootId)
+      assert.ok(oldTree, "Could not find DOM node '#" + rootId + "' to update")
      const newTree = _router(newState.app.location, newState, send, oldState)
      newTree.setAttribute('id', rootId)
      yo.update(oldTree, newTree)