warn on unmount (#485)

2017-04-26 13:52:34 +02:00
parent 357d7d14b5
commit 6cf13af5ce
2 changed files with 2 additions and 1 deletions
@@ -57,6 +57,7 @@ function Choo (opts) {
      }
      var newTree = router(createLocation())
      tree = nanomorph(tree, newTree)
+      assert.notEqual(tree, newTree, 'choo.start: a different node type was returned as the root node on a rerender. Make sure that the root node is always the same type to prevent the application from being unmounted.')
      if (hasPerformance && timingEnabled) {
        window.performance.mark('choo:renderEnd')
        window.performance.measure('choo:render', 'choo:renderStart', 'choo:renderEnd')