@react-navigation/routers/lib/module/BaseRouter.js

Routers to help build custom navigators

"use strict";

import { nanoid } from 'nanoid/non-secure';
/**
 * Base router object that can be used when writing custom routers.
 * This provides few helper methods to handle common actions such as `RESET`.
 */
export const BaseRouter = {
  getStateForAction(state, action) {
    switch (action.type) {
      case 'SET_PARAMS':
      case 'REPLACE_PARAMS':
        {
          const index = action.source ? state.routes.findIndex(r => r.key === action.source) : state.index;
          if (index === -1) {
            return null;
          }
          return {
            ...state,
            routes: state.routes.map((r, i) => i === index ? {
              ...r,
              params: action.type === 'REPLACE_PARAMS' ? action.payload.params : {
                ...r.params,
                ...action.payload.params
              }
            } : r)
          };
        }
      case 'RESET':
        {
          const nextState = action.payload;
          if (nextState.routes.length === 0 || nextState.routes.some(route => !state.routeNames.includes(route.name))) {
            return null;
          }
          if (nextState.stale === false) {
            if (state.routeNames.length !== nextState.routeNames.length || nextState.routeNames.some(name => !state.routeNames.includes(name))) {
              return null;
            }
            return {
              ...nextState,
              routes: nextState.routes.map(route => route.key ? route : {
                ...route,
                key: `${route.name}-${nanoid()}`
              })
            };
          }
          return nextState;
        }
      default:
        return null;
    }
  },
  shouldActionChangeFocus(action) {
    return action.type === 'NAVIGATE' || action.type === 'NAVIGATE_DEPRECATED';
  }
};
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