Function reset

packages/core/src/StateUtils.js:180–202

* Resets all routes. * Note that this moves the index to the position to where the last route in the * stack is at if the param `index` isn't provided.

(state, routes, index)

   * stack is at if the param `index` isn't provided.
   */
  reset(state, routes, index) {
    invariant(
      routes.length && Array.isArray(routes),
      'invalid routes to replace'
    );

    const nextIndex = index === undefined ? routes.length - 1 : index;

    if (state.routes.length === routes.length && state.index === nextIndex) {
      const compare = (route, ii) => routes[ii] === route;
      if (state.routes.every(compare)) {
        return state;
      }
    }

    invariant(!!routes[nextIndex], 'invalid index %s to reset', nextIndex);

    return {
      ...state,
      index: nextIndex,
      routes,
    };
  },
};

export default StateUtils;