New

• New helper method createNamespacedHelpers: a helper-generator that generates namespaced mapXXX helpers for you:

  const { mapState, mapActions } = createNamespacedHelpers('some/nested/module')
  // everything generated by mapState and mapActions are bound to the module.
  

  See docs for more info.

  (@riophae via #800)

Misc

• Various typing and assertion improvements.