getErrors missing after migration to 2.0.0

[mgreer]

Migrating from previous release to 2.0.0 and webpack 4, I suddenly get this error:

Uncaught (in promise) TypeError: (0 , n.getError) is not a function

Curious, since the AsyncComponent class should be setting this method, and class seems to have shouldRehydrate.
Error is here:

        // browser
        if (env === 'browser') {
          var _state$asyncComponent = state.asyncComponents,
              shouldRehydrate = _state$asyncComponent.shouldRehydrate,
              getError = _state$asyncComponent.getError; // <== error is here

          var error = getError(state.id);
          if (error) {
            state.error = error;
            return false;
          }
          return shouldRehydrate(state.id) ? doResolve() : false;
        }

Previous release worked in webpack 4.